If the first cube has a volume of 125 cm³ and the second cube has a volume of 343 cm³, the difference in the area of one face of the second cube and the area of one face of the first cube is 24cm². The answer is B. 24 cm².
To find the difference in the area of one face of each cube, we first need to find the side length of each cube. Since the volume of a cube is equal to the side length cubed (V = s³), we can find the side length by taking the cube root of the volume.
For the first cube:
Volume = 125 cm³
Side length = cube root of 125 = 5 cm
For the second cube:
Volume = 343 cm³
Side length = cube root of 343 = 7 cm
Next, we find the area of one face of each cube. The area of one face of a cube is equal to the side length squared (A = s²).
Area of one face of the first cube:
A1 = 5² = 25 cm²
Area of one face of the second cube:
A2 = 7² = 49 cm²
Finally, find the difference in the area of one face of each cube:
Difference = A2 - A1 = 49 cm² - 25 cm² = 24 cm²
The answer is B. 24 cm².
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2x+y=18
x+2y=-6
Solve the systems of equations
Answer:
(14, -10)
Step-by-step explanation:
A small country emits 103,000 kilotons of carbon dioxide per year. In a recent global agreement, the country agreed to cut its carbon emissions by 5% per year for the next 14 years. In the first year of the agreement, the country will keep its emissions at 103,000 kilotons and the emissions will decrease 5% in each successive year. How many kilotons of carbon dioxide would the country emit over the course of the 14 year period, ?
The total amount of carbon dioxide emitted over the 14-year period is 879,594.08 kilotons.
The small country emits 103,000 kilotons of carbon dioxide per year and agreed to cut its emissions by 5% per year for the next 14 years, starting with 103,000 kilotons in the first year.
To find the total amount of carbon dioxide emitted over the 14-year period, follow these steps:
1. Determine the initial amount of emissions: 103,000 kilotons in the first year.
2. Calculate the reduction rate per year: 5% or 0.05.
3. Calculate the total emissions for each year using the formula:
Emissions = Initial Emissions * (1 - Reduction Rate)^Year
4. Sum up the emissions for all 14 years.
Hence,
Year 1: 103,000 * (1 - 0.05)^0 = 103,000 kilotons
Year 2: 103,000 * (1 - 0.05)^1 = 97,850 kilotons
Year 3: 103,000 * (1 - 0.05)^2 = 93,057.50 kilotons
...
Year 14: 103,000 * (1 - 0.05)^13 = 56,516.87 kilotons
Now, add up the emissions for all 14 years:
Total Emissions = 103,000 + 97,850 + 93,057.50 + ... + 56,516.87 = 879,594.08 kilotons.
Therefore, the total amount of carbon dioxide emitted over the 14-year period is approximately 879,594.08 kilotons.
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Let X = the score out of 3 points on a randomly selected quiz in a Prob
& Stat course. The table gives the probability distribution of X.
Value
0
1
2
3
Probability
0. 05
0. 15
0. 60
A) Find the missing value for P(X = 1) in the probability distribution.
B) P(X 2 2) =
C) P(X > 2) =
D) The probability of "At least 2" is equivalent to
A. The missing value for P(X = 1) is 0.20.
B. The value of P(X ≤ 2) is 0.85.
C. The value of P(X > 2) is 0.15.
D. The probability of "At least 2" is equivalent to P(X >= 2), which is 0.75.
In probability theory, a probability distribution is a function that assigns probabilities to each possible value of a random variable.
In this Problem, we have a probability distribution for the score on a quiz, with X being the random variable and the table providing the probability of each possible score. In this answer, we will use the given probability distribution to answer the questions posed.
A) Find the missing value for P(X = 1) in the probability distribution.
To find the missing value for P(X = 1), we need to use the fact that the sum of the probabilities for all possible values of X must be equal to 1. Therefore, we can set up an equation:
P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) = 1
Substituting in the given probabilities, we get:
0.05 + P(X = 1) + 0.60 + 0.15 = 1
Simplifying, we get:
P(X = 1) = 0.20
Therefore, the missing value for P(X = 1) is 0.20.
B) P(X ≤ 2) =
To find P(X ≤ 2), we need to add up the probabilities of X being less than or equal to 2. This is equivalent to:
P(X ≤ 2) = P(X = 0) + P(X = 1) + P(X = 2)
Substituting in the given probabilities, we get:
P(X ≤ 2) = 0.05 + 0.20 + 0.60 = 0.85
Therefore, P(X ≤ 2) is 0.85.
C) P(X > 2) =
To find P(X > 2), we need to add up the probabilities of X being greater than 2. This is equivalent to:
P(X > 2) = P(X = 3)
Substituting in the given probabilities, we get:
P(X > 2) = 0.15
Therefore, P(X > 2) is 0.15.
D) The probability of "At least 2" is equivalent to P(X >= 2)
To find the probability of "At least 2," we need to add up the probabilities of X being greater than or equal to 2. This is equivalent to:
P(X ≥ 2) = P(X = 2) + P(X = 3)
Substituting in the given probabilities, we get:
P(X ≥ 2) = 0.60 + 0.15 = 0.75
Therefore, the probability of "At least 2" is equivalent to P(X ≥ 2), which is 0.75.
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A wildlife refuge in South America has howler monkeys and spider monkeys. A biologist working there randomly selected eight adults of each type of monkey, weighed them, and recorded their weights in pounds. Show your work.
howler monkey: {16, 17, 18, 18, 18, 20, 22, 23}
spider monkey: {8, 10, 10, 11, 11, 12, 14, 14}
Calculate the meaning and MAD for each type of monkey.
Calculate the means-to-MAD ratio for the two types of monkeys.
What inference can be made about the weight of both types of monkeys? Explain.
Howler monkeys are heavier on average than spider monkeys (17.75 lbs vs. 11.25 lbs).
How to solveCalculate the mean:
Some of the weights divided by the number of monkeys
Calculate the MAD:
Find the absolute deviation (difference) of each weight from the mean
Calculate the average of these deviations
Mean Howler Monkey = (16+17+18+18+18+20+22+23)/8 = 142/8 = 17.75 lbs
Mean Spider Monkey = (8+10+10+11+11+12+14+14)/8 = 90/8 = 11.25 lbs
Now, we calculate the MAD for each type of monkey:
MAD Howler Monkey= 1.875 lbs
MAD Spider Monkey= 1.5625 lbs
we calculate the means-to-MAD ratio for both types of monkeys:
Howler Monkey: Mean/MAD = 17.75/1.875 = 9.466
Spider Monkey: Mean/MAD = 11.25/1.5625 = 7.2
Inference:
Howler monkeys are heavier on average than spider monkeys (17.75 lbs vs. 11.25 lbs).
The means-to-MAD ratio shows that howler monkeys have more consistent weights (9.466) compared to spider monkeys (7.2), as a higher ratio indicates less variability in weights.
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The lateral area of a cone is 614cm squared. The radius is 16.2 cm. What is the slant height to the nearest tenth of a cm?
The slant height of the given cone is 16.36 cm.
What is the slant height?The length from the base to the peak along the "center" of a lateral face of an object (like a frustum or pyramid) is its slant height.
It is, in other words, the height of the triangle that a lateral face is a part of (Kern and Bland 1948, p.
So, calculate the slant height as follows:
614π = πr√h²+r²
614 = 16.2√h²+16.2²
614 = 262.44√h²
614/262.44 = h
2.33
Height = 2.33 cm
Then, slant height formula:
s=√(r² + h²)
s=√(16.2² + 2.33²)
s=√267.8689
s=16.36 cm
Therefore, the slant height of the given cone is 16.36 cm.
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An ancient ruler is 9 inches long. The only marks that remain are at 1 inch and 2 inches, 9 inches and one mark. It is possible to draw line segments of the whole number lengths from 1 to 9 inches without moving the ruler. What inch number is on the other mark
If the only marks that remain are at 1 inch and 2 inches, 9 inches and one mark, the missing mark corresponds to the number 6.
This is a classic problem in recreational mathematics, also known as the "burnt ruler problem". To solve it, we need to think creatively and use rational expressions and equations.
First, we note that the distance between the two marks is 9-2=7 inches. We can imagine the ruler as a number line from 0 to 9, where the two marks correspond to the numbers 1 and 2. We want to find the other mark, which corresponds to some number x between 2 and 9.
Next, we observe that we can use the ruler to construct line segments of length 1, 2, 3, 4, 5, 6, 7, 8, and 9 by adding or subtracting these lengths using the two marks as reference points. For example, we can construct a line segment of length 3 by starting at the mark at 2, moving 1 inch to the right, and then moving 2 more inches to the right.
Now, we notice that any line segment of length n can be expressed as a difference of two line segments of smaller lengths. For example, a line segment of length 7 can be expressed as the difference between a line segment of length 2 and a line segment of length 5. More generally, we can write:
n = a - b
where a and b are integers between 1 and n-1.
Using this observation, we can try to find a way to express the length of the missing segment x as a difference of two integers between 1 and 7. We can start by listing all possible values of a and b:
a=2, b=1: 2-1=1
a=3, b=1: 3-1=2
a=4, b=1: 4-1=3
a=5, b=1: 5-1=4
a=6, b=1: 6-1=5
a=7, b=1: 7-1=6
a=3, b=2: 3-2=1
a=4, b=2: 4-2=2
a=5, b=2: 5-2=3
a=6, b=2: 6-2=4
a=4, b=3: 4-3=1
a=5, b=3: 5-3=2
a=6, b=3: 6-3=3
a=5, b=4: 5-4=1
a=6, b=4: 6-4=2
a=6, b=5: 6-5=1
We notice that the only values of a and b that work are 6 and 1, respectively, since 6-1=5, which is the length of the line segment between the two marks that was not given.
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Find the new coordinates for the image under the given translation. Square RSTU with vertices R(-2, 1), S(3, 4), T(6, -1), and U(1, -4): (x, y) → (x-4, y − 1) - -9-8-7 -6 -5 -4 -3 -2 -1 0 1 2 R' (, ) S' (, ) T'(,0) U'(,) 3 4 LO 5 6 7 8 9
Thus, the new coordinates for the image of translated Vertices of Square RSTU are- R'(-6, 0), S'(-1, 3), T'(2, -2) and U'(-3, -5).
Define about the translations:In mathematics, a translation moves an object throughout the coordinate plane while preserving its dimensions and shape. After a translation, its area and orientation remain unchanged.
The vertical shift, horizontal shift, or perhaps a combination of the two can be referred to as a translation in mathematics.
Given that:
Vertices of Square RSTU.
R(-2, 1), S(3, 4), T(6, -1), and U(1, -4):
translation: (x, y) → (x-4, y − 1)
New vertices:
R(-2-4, 1 − 1) --> R'(-6, 0)
S(3-4, 4 − 1), ---> S'(-1, 3)
T(6-4, -1 − 1), -> T'(2, -2)
U(1-4, -4 − 1) --> U'(-3, -5)
Thus, the new coordinates for the image of translated Vertices of Square RSTU are- R'(-6, 0), S'(-1, 3), T'(2, -2) and U'(-3, -5).
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researchers studying the effect of antibiotic treatment for acute sinusitis compared to symptomatic treatments randomly assigned 166 adults diagnosed with acute sinusitis to one of two groups: treatment or control. study participants received either a 10-day course of amoxicillin (an antibiotic) or a placebo similar in appearance and taste. the placebo consisted of symptomatic treatments such as acetaminophen, nasal decongestants, etc. at the end of the 10-day period, patients were asked if they experienced improvement in symptoms. the distribution of responses is summarized below.3 self-reported improvement in symptoms yes no total treatment 66 19 85 group control 65 16 81 total 131 35 166 (a) what percent of patients in the treatment group experienced improvement in symptoms? (b) what percent experienced improvement in symptoms in the control group? (c) in which group did a higher percentage of patients experience improvement in symptoms? (d) your findings so far might suggest a real difference in effectiveness of antibiotic and placebo treatments for improving symptoms of sinusitis. however, this is not the only possible conclusion that can be drawn based on your findings so far. what is one other possible explanation for the observed difference between the percentages of patients in the antibiotic and placebo treatment groups that experience improvement in symptoms of sinusitis?
77.6% of patients in the antibiotic treatment group experienced improvement in symptoms, while 80.2% of patients in the placebo group experienced improvement. The control group had a slightly higher percentage of improvement. The placebo effect could have contributed to the difference in improvement rates.
The percent of patients in the treatment group who experienced improvement in symptoms is 77.6% ((66/85) x 100). The percent of patients in the control group who experienced improvement in symptoms is 80.2% ((65/81) x 100).
The control group had a higher percentage of patients experience improvement in symptoms (80.2%) compared to the treatment group (77.6%).
One possible explanation for the observed difference between the percentages of patients in the antibiotic and placebo treatment groups that experience improvement in symptoms of sinusitis is that the placebo effect may have played a role.
The placebo effect is a phenomenon in which patients who receive a treatment that is not expected to have a therapeutic effect experience an improvement in their symptoms due to their belief in the treatment.
Therefore, the symptomatic treatments provided in the placebo group may have led to an improvement in symptoms, even though they did not receive an antibiotic.
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The value of an investment at simple interest is given by the formula
a
=
p
+
p
r
t
.
a is the final value after t years at the interest rate r (as a decimal) if the initial amount p is invested.
solve for t and solve for how long $200 must be invested at 8% interest to reach a value of $248?
It would take 15 years of investing $200 at 8% interest to reach a value of $248.
To solve for t, we can rearrange the formula:
a = p + prt
a - p = prt
t = (a - p) / (pr)
To solve for how long $200 must be invested at 8% interest to reach a value of $248, we can plug in the given values into the formula and solve for t:
a = 248
p = 200
r = 0.08
t = (a - p) / (pr)
t = (248 - 200) / (200 * 0.08)
t = 15
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Find the derivative y = cot (sen x/X + 14)
To find the derivative of y = cot(sen x/X + 14), we need to use the chain rule and the derivative of cot(x) which is -csc^2(x).
First, we let u = sen x/X + 14.
Then, we can rewrite y as y = cot(u).
Using the chain rule, the derivative of y with respect to x is:
dy/dx = dy/du * du/dx
To find dy/du, we need to use the derivative of cot(u) which is -csc^2(u).
So,
dy/du = -csc^2(u)
To find du/dx, we need to use the quotient rule.
Let v = X, so u = sen x/v + 14.
Then,
du/dx = (v*cos x - sen x * 0)/(v^2)
du/dx = cos x/v
Now we can substitute the values of dy/du and du/dx:
dy/dx = dy/du * du/dx
dy/dx = (-csc^2(u)) * (cos x/v)
But u = sen x/X + 14, so we substitute this in:
dy/dx = (-csc^2(sen x/X + 14)) * (cos x/X)
Therefore, the derivative of y = cot(sen x/X + 14) is
dy/dx = (-csc^2(sen x/X + 14)) * (cos x/X).
To find the derivative of y = cot(sen(x)/(x + 14)), we will use the quotient rule and the chain rule.
Let u = sen(x) and v = x + 14, then y = cot(u/v).
First, find the derivatives of u and v:
du/dx = cos(x) (since the derivative of sen(x) is cos(x))
dv/dx = 1 (since the derivative of x is 1, and the derivative of a constant is 0)
Now, apply the quotient rule for cotangent:
d(cot(u/v))/dx = -1/(sin^2(u/v)) * (du/dv - u*dv/dx) / (v^2)
Substitute the expressions for u, v, du/dx, and dv/dx:
dy/dx = -1/(sin^2(sen(x)/(x + 14))) * ((cos(x)*(x + 14) - sen(x)*1) / (x + 14)^2)
This is the derivative of y with respect to x.
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1. An enclosure at the zoo holds two squirrel monkeys. The floor of the enclosure is a rectangle that has an area of 36 square feet. Then the zoo gets four more squirrel monkeys. The rules say that the zoo must add 9 square feet to the floor area for each additional monkey. What must the area of the floor be for all six monkeys? Explain
To find the area of the floor needed for 6 squirrel monkeys, first calculate the additional area needed for 4 monkeys 4 x 9 = 36 square feet. Add this to the initial area of 36 square feet, to get a total area of 72 square feet. Thus, the floor area for all six monkeys should be 72 square feet.
Let's first find the area of the floor required for the additional 4 monkeys
4 additional monkeys * 9 sq ft per monkey = 36 sq ft
So, to accommodate all 6 monkeys, the total floor area required would be
36 sq ft (original area) + 36 sq ft (additional area) = 72 sq ft
Therefore, the area of the floor for all six monkeys must be 72 square feet.
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For the function f(x)= 4x³ – 36x² +1.
(a) Find the critical numbers of f(if any) (b) Find the open intervals where the function is increasing or decreasing.
(a) The critical numbers are x = 0 and x = 6.
(b) The function is increasing on the interval (0, 6) and decreasing on the intervals (-∞, 0) and (6, ∞).
How to find the critical numbers of f(x)?(a) To find the critical numbers of f(x), we need to find the values of x where f'(x) = 0 or f'(x) does not exist.
f'(x) = 12x² - 72x
Setting f'(x) = 0, we get:
12x² - 72x = 0
12x(x - 6) = 0
So, the critical numbers are x = 0 and x = 6.
How to determine where the function is increasing or decreasing?(b) To determine where the function is increasing or decreasing, we need to examine the sign of f'(x) on different intervals.
For x < 0, f'(x) = 12x² - 72x < 0, which means the function is decreasing on (-∞, 0).
For 0 < x < 6, f'(x) = 12x² - 72x > 0, which means the function is increasing on (0, 6).
For x > 6, f'(x) = 12x² - 72x < 0, which means the function is decreasing on (6, ∞).
So, the function is increasing on the interval (0, 6) and decreasing on the intervals (-∞, 0) and (6, ∞).
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Part A: An angle is two collinear rays with a common endpoint Find an example that contradicts this definition How would you change the delito
accurate? (5 points)
Part B: Give an example of an undefined term and how it pertains to angles (5 points)
PLEASE HELP ME !!
Part A: The given definition states that an angle is two collinear rays with a common endpoint. Part B : A point is an example of an undefined term.In relation to angles, a point is crucial as it serves as the common endpoint of the two rays that form the angle.
Part A : The given definition states that an angle is two collinear rays with a common endpoint. However, this definition is incorrect as it contradicts the correct definition of an angle. In the correct definition, an angle is formed by two non-collinear rays with a common endpoint.
An example that contradicts the given definition is when you have two rays, AB and BC, with B being the common endpoint. If they were collinear, they would lie along the same straight line, and thus, no angle would be formed between them. To make the definition accurate, you would need to change it to: "An angle is formed by two non-collinear rays with a common endpoint."
Part B: An undefined term in geometry is a term that cannot be defined using other known geometric terms, but its meaning is generally understood. One example of an undefined term is a point. A point is a basic element in geometry, and it has no size, shape, or dimensions. It is merely a location in space. For instance, when discussing angle ABC, point B is the common endpoint of rays AB and BC.
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If the table shows the results for spinning the spinner 50 times. What is the relative frequency for the event "spin a 2"
The relative frequency for the event of spin a 2 is P = 0.16
Given data ,
Let the total number of times the event occurs = 50
Now , the number of times the spin of 2 occurs = 8 times
So , the relative frequency is given by
Relative Frequency = Subgroup frequency / Total frequency
P = 8 / 50
P = 0.16
Hence , the relative frequency is 0.16
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The complete question is attached below :
If the table shows the results for spinning the spinner 50 times. What is the relative frequency for the event "spin a 2"
A man is sitting at a park bench 92 feet away from an office building. The medical examiner and other
investigators have determined that the bullet entered the man's head at an angle of 26° and at about 3. 7 feet
off the ground. If the man was shot from the office building, about how high off of the ground was the shooter
located?
The shooter was located approximately 36.15 feet off the ground.
How high was the shooter located?We can use trigonometry to solve for the height of the shooter.
First, we need to find the horizontal distance from the shooter to the man on the park bench. We can use the angle of 26° and the distance of 92 feet to calculate this distance:
horizontal distance = 92 feet * cos(26°)
horizontal distance = 82.33 feet
Next, we can use the height of 3.7 feet and the horizontal distance of 82.33 feet to find the height of the shooter:
tan(26°) = height difference / horizontal distance
height difference = horizontal distance * tan(26°)
height difference = 82.33 feet * tan(26°)
height difference = 36.15 feet
Therefore, the shooter was located approximately 36.15 feet off the ground.
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What is the volume of a cone with a radius of 2.5 and a height of 4 answer in terms of pi
options:
-20 5/6π
-25π
-8 1/3π
-15 5/8π
Answer:
Sure, I can help you with that! The volume of a cone with a radius of 2.5 and a height of 4 is (1/3)*pi*(2.5^2)*4. This equals approximately 26.18 cubic units.
I am wondering what’s 75% of 188
I know 50% of 188 is 94 and 25% is 47
Answer: 141
Step-by-step explanation: 188 x 75% = 141
Answer:
141
Step-by-step explanation:
I looked it up.
A researcher collected the number of letters in each of 200 first names. The data are found to be normally distributed with a mean of 5. 82 and a standard deviation of 1. 43.
What percentage of first names have seven letters or less?
79. 4%
82. 5%
84. 1%
99. 8%
If a researcher collected the number of letters in each of 200 first names, approximately 79.4% of first names have seven letters or less. Therefore, the correct answer is 79.4%.
To find the percentage of first names with seven letters or less, we will use the mean (5.82) and standard deviation (1.43) of the normally distributed data. We will calculate the z-score for a name with seven letters:
z = (7 - 5.82) / 1.43
z ≈ 0.83
Now, using a z-table or a calculator that can compute the cumulative distribution function (CDF) of a standard normal distribution, we find the probability associated with the z-score:
P(z ≤ 0.83) ≈ 79.4%
So, approximately 79.4% of first names have seven letters or less. The correct answer is 79.4%.
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In a discussion between Modise and Benjamin about functions, Benjamin said that the diagram below represents a function, but Modise argued that it does not. Who is right? Motivate your answer. x - Input value 5 8 y-Output value - 2 - S 7 -9
Modise is correct, as the input of 5 is mapped to the outputs of 2 and 9, hence the relation does not represent a function.
When does a relation represents a function?A relation represents a function if each value of the input is mapped to only one value of the output, that is, one input cannot be mapped to multiple outputs.
For a point in the standard format (x,y), we have that:
x is the input.y is the output.The meaning is that the input given by the x-coordinate is mapped to the output given by the y-coordinate.For this problem, there are two arrows departing the input of 5, meaning that the input of 5 is mapped to the outputs of 2 and 9, hence the relation is not a function.
Missing InformationThe diagram is given by the image presented at the end of the answer.
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Jocelyn is designing a bed for cactus specimens at a botanical garden. The total area can be
modeled by the expression 2x2 + 7x +3, where x is in feet.
Suppose in one design the length of the cactus bed is 4x, and in another, the length is 2x + 1. What are the widths of
the two designs?
The width of the first design is -2.5 feet and the width of the second design is 0.5 feet.
How to calculate thw widthFor the first design, where the length is 4x, the total area is:
2(4x)² + 7(4x) + 3 = 32x² + 28x + 3
To find the width, we can divide the total area by the length:
width = (32x² + 28x + 3) / 4x
width = 8x + 7 + 3/4x
For the second design, where the length is 2x + 1, the total area is:
2(2x + 1)² + 7(2x + 1) + 3 = 8x² + 23x + 5
width = (8x² + 23x + 5) / (2x + 1)
width = 4x + 2 + 1/(2x + 1)
For the first design:
width = 8(-1/2) + 7 + 3/4(-1/2) = -2.5 feet
For the second design:
width = 4(-1/2) + 2 + 1/(2(-1/2) + 1) = 0.5 feet
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HELP PLEASE I AM STRUGGLING!!!!!!!!!!!!
During a survey of 240 people who own cats, 188 people preferred cat food A to cat food B. Based on these results, in the second survey of 60 people, how many people can be predicted to prefer cat food A?
Based on the first survey results, we can predict that around 47 people in the second survey of 60 people will prefer cat food A over cat food B.
Based on the results of the first survey, 188 out of 240 people preferred cat food A over cat food B. To predict the preference for cat food A in the second survey, we can calculate the proportion of people who preferred cat food A in the first survey and apply it to the sample size of the second survey.
First, find the proportion of people preferring cat food A in the first survey:
Proportion = (Number of people preferring cat food A) / (Total number of people surveyed)
Proportion = 188 / 240
Proportion ≈ 0.7833
Now, apply this proportion to the second survey's sample size of 60 people:
Predicted preference = Proportion × (Sample size of the second survey)
Predicted preference = 0.7833 × 60
Predicted preference ≈ 47
Therefore, based on the first survey results, we can predict that around 47 people in the second survey of 60 people will prefer cat food A over cat food B.
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1. Solve the following set of equations by using substitution or elimination. (1 point)
[2x+y=1
2x+3y=-41
O (9,-18)
O (10,-19.5)
O (11,-21)
O (12,-22)
Answer:
C. (11,-21)
Step-by-step explanation:
Elimination
2x+y=1....(1)
2x+3y=-41....(2)
You can eliminate x in this case. (2)-(1)
2y=-42
y=-21.....(3)
You can substitute (3) in (1)
2x-21=1
2x-21+21=1+21
2x=22
x=11
Final answer: (11, -21)
You estimated that you would need 252 more points to move up a level on your favorite
video game. But after earning just 240more points, you leveled up! What was your percent
error?
(Show all work)
The percent error is 4.76%.
To find the percent error, we first need to calculate the actual error, which is the absolute difference between the estimated points and the actual points:
Actual error = |252 - 240| = 12
Next, we need to calculate the percent error, which is the ratio of the actual error to the estimated value, expressed as a percentage:
Percent error = (actual error / estimated value) x 100%
Percent error = (12 / 252) x 100%
Percent error = 4.76%
Therefore, the percent error is 4.76%.
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what’s the inverse of f(x) for f(x)=4x-3/7
Answer:
x/4 + 3/28 = y
Step-by-step explanation:
To find the inverse, switch the x's and y's (note that f(x) is y) and solve for y:
x = 4y - 3/7
x + 3/7 = 4y
x/4 + 3/28 = y
Answer:
−1(x) = 3√2(x+7) 2 f - 1 (x) = 2 (x + 7) 3 2 is the inverse of f (x) = 4x3 − 7 f (x) = 4 x 3 - 7.
integral of e to -x cos2x from 0 to infinity
The integral value of [tex]e ^{-x cos2x}[/tex] under the given condition is 1/4.
The integral of [tex]e ^{-x cos2x}[/tex] from 0 to infinity can be solved using integration by parts.
Let u = cos(2x) and dv = [tex]e^{(-x)dx}[/tex].
Then du/dx = -2sin(2x) and v = [tex]-e^{(-x)}[/tex].
Using integration by parts, we get:
∫[tex]e^{(-x)cos(2x)dx}[/tex] = [tex]-e^{(-x)cos(2x)/2}[/tex] + ∫[tex]e^{(-x)sin(2x)dx}[/tex]
Now, let u = sin(2x) and dv = [tex]e^{(-x)dx}[/tex]
Then du/dx = 2cos(2x) and v =[tex]-e^{(-x)}[/tex].
Using integration by parts again, we get:
∫[tex]e^{(-x)cos(2x)dx}[/tex] = [tex]-ex^{(-x)cos(2x)/2}[/tex] - [tex]e^{(-x)sin(2x)/4}[/tex] + C
here
C = constant of integration.
Therefore, the integral of [tex]e^{(-x)cos(2x)}[/tex] from 0 to infinity is
= [tex]-e^{(0)(cos(0))/2}[/tex] - [tex]e^{(0)(sin(0))/4 }[/tex]+[tex]e^{ (-infinity)(cos(infinity))/2}[/tex] + [tex]e^{(-infinity)(sin(infinity))/4.}[/tex]
Simplifying this expression gives us:
∫[tex]e^{(-x)cos(2x)dx }[/tex]
= 1/4
The integral value of [tex]e ^{-x cos2x}[/tex] under the given condition is 1/4.
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A large container has 6 gallons of acid that needs to be dilluted by adding water. define the formula that models the ratio of the number of gallons of acid in the container compared to the total volume of liquid in the container when x gallons of water is added
The formula that models the ratio y is:
y = 6 / (6 + x)
Let y be the ratio of the number of gallons of acid in the container compared to the total volume of liquid in the container, and let x be the number of gallons of water added to the container.
Initially, the container has 6 gallons of acid and 0 gallons of water, for a total volume of 6 gallons. When x gallons of water is added, the total volume of liquid becomes 6 + x gallons, and the amount of acid remains at 6 gallons.
Therefore, the formula that models the ratio y is:
y = 6 / (6 + x)
This formula gives the ratio of the number of gallons of acid in the container compared to the total volume of liquid in the container when x gallons of water is added.
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The price of a calculator is decreased by
31
%
and now is
$
189. 6. Find the original price
Answer:
274.78
Step-by-step explanation:
Let's call the original price "x".
We know that the price decreased by 31%, so the new price is
100% - 31% = 69% of the original price:
0.69x = 189.6
To solve for x, we can divide both sides by 0.69:
x = 189.6 / 0.69
Simplifying this expression, we get:
x ≈ 274.78
Therefore, the original price was approximately $274.78.
What is the magnitude of the electrostatic force exerted by
sphere a on sphere b?
2. 0 m-
а
b
+1. 0 x 10-6c
-1. 6 x 10-60
We are not given the distance between the spheres, so we cannot calculate the force without that information.
To calculate the electrostatic force between the two charged spheres, we can use Coulomb's law, which states that the magnitude of the electrostatic force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
Mathematically, we can express this as:
F = k * (q1 * q2) / r^2
Where F is the electrostatic force, k is Coulomb's constant (9 x 10^9 N m^2/C^2), q1 and q2 are the charges of the spheres, and r is the distance between their centers.
We are given the charges of the two spheres: sphere A has a charge of +1.0 x 10^-6 C, and sphere B has a charge of -1.6 x 10^-6 C.
However, we are not given the distance between the spheres, so we cannot calculate the force without that information.
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In a certain high school, a survey revealed the mean amount of bottled water consumed by students each day
was 153 bottles with a standard deviation of 22 bottles. Assuming the survey represented a normal distribution,
what is the range of the number of bottled waters that approximately 68. 2% of the students drink?
The range of the number of bottled waters that approximately 68. 2% of the students drink is between 131 and 175 bottled waters per day.
The range of the number of bottled waters that approximately 68.2% of the students drink can be calculated using the empirical rule, also known as the 68-95-99.7 rule.
According to this rule, for a normal distribution:
Approximately 68.2% of the data falls within one standard deviation of the mean
Approximately 95.4% of the data falls within two standard deviations of the mean
Approximately 99.7% of the data falls within three standard deviations of the mean
falls within a certain number of standard deviations from the mean
Since we are interested in the range of values that approximately 68.2% of the students drink, we can start by calculating one standard deviation from the mean:
One standard deviation = mean ± standard deviation
= 153 ± 22
= 131 to 175
This answer is based on the empirical rule, which is a useful tool for understanding the spread of data in a normal distribution. It tells us that for a normal distribution, a certain percentage of the data
Therefore, approximately 68.2% of the students drink between 131 and 175 bottled waters per day.
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