Answers
Answer:
Integral: [tex]\int\limits^\pi _0 {3sinx} \, dx[/tex]
Area: 6
Step-by-step explanation:
[tex]\int\limits^\pi _0 {3sinx} \, dx = -3[cosx]_{0} ^{\pi} = 6[/tex]
Related Questions
Explain why a graph that fails the vertical-line test does not represent a function. Be sure to use the definition of a function in your answer
Answers
Explanation:
A function is a relationship where any one x-value/input only has one corresponding y-value/output. (note: a y-value can have multiple x-values).
> This can be called "assigning one y-value to every x element".
The vertical line test places a line that would connect all y-values of an x-value (that is, if it were to have multiple y-values). If multiple points can be found along the vertical line, it is, therefore, by the definition of a function, not a function. (Because an x-value will have more than one y-value).
So, a graph that fails the vertical-line test does not represent a function because an x-value will correspond with more than one y-value.
hope this helps!!
A manufacturer of pacemakers wants the standard deviation of the lifetimes of the batteries to be less than 1.8 months. A sample of 20 batteries had a standard deviation of 1.6 months. Assume the variable is normally distributed. Find the 95% confidence interval of the standard deviation of the batteries. Based on this answer, do you feel that 1.8 months is a reasonable estimate?
Answers
Answer:
Look down my answer↓:
Step-by-step explanation:
The United States Postal Service reports that 90% of first-class mail within the same city is delivered in two days of the time of mailing. Ten letters are randomly sent to different locations. a. What is the probability that all 10 will arrive within two days? b. What is the probability that exactly 8 will arrive within two days? c. What is the probability that 5 or fewer will arrive within two days? d. What is the mean number of letters that will arrive within two days? e. What is the standard deviation of the number of letters that will arrive within two days?
Answers
a)The probability that all 10 will arrive within two days is 0.3486.
b) P(x = 8) = 0.1937
c) P(x=5)= 0.0014
d) mean = 9
e) Standard deviation = √0.90 = 0.9486
What is Binomial Probability?The binomial distribution model allows us to compute the probability of observing a specified number of "successes" when the process is repeated a specific number of times and the outcome for a given patient is either a success or a failure.
Given:
p = 90/100 = 0.90
q(probability of success) = 1 - p = 1 - 0.90 = 0.10
n = 10
a)The probability that all 10 will arrive within two days
P(x = 10) = 0.3486
b) P(x = 8) = 0.1937
c) P(x=5)= 0.0014
d) mean = np = 10 × 0.90 = 9
e) Variance = npq = 10 × 0.90 × 0.10 = 0.90
Standard deviation = √0.90 = 0.9486
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On a coordinate plane, a parabola opens down with solid circles along the parabola at (negative 3, negative 5), (negative 2, 0), (negative 1, 3), (0, 4), (1, 3), (2, 0), (3, negative 5). Which statement is true regarding the intervals where the function is increasing and decreasing? The function is increasing from (–∞, 0). The function is increasing from (0, ∞). The function is decreasing from (–∞, 0). The function is decreasing from (–∞, ∞).
Answers
The true statement regarding the intervals where the function is increasing and decreasing is option A: The function is increasing from (–∞, 0).
What is a function?A function is defined as a relation between the set of inputs having exactly one output each.
On a coordinate plane, a parabola opens down with solid circles along the parabola at (-3, -5), (-2, 0), (-1, 3), (0, 4), (1, 3), (2, 0), (3, -5).
The domain is all real numbers.
The range is all real numbers.
If for an interval I, when x decreases meanwhile staying in interval I, the function's output increases (or can stay same), then we say that the function is increasing in the interval.
The true statement regarding the intervals where the function is increasing and decreasing is option A: The function is increasing from (–∞, 0).
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Answer:
A
Step-by-step explanation:
There are 60 minutes in an hour. The total number of minutes is a function of the number of hours, as shown in the table. Does this situation represent a linear or non-linear function, and why?
Answers
Answer:
linear; the rate of change is constant
Which of the following is the center and radius of the circle?
x2 + y2 + 4x – 14y + 46 = 0
Center (2, –7); r = 7
Center (–4, 14); r equals square root 46
Center (4, –14); r = 46
Center (–2, 7); r equals square root 7
Answers
The centre of the circle is (-2,7) and the radius is √7 , Option D is the right answer.
What is the standard equation of a Circle ?The standard equation of a Circle is
(x-h)² +(y-k)² = r²
where h and k is the centre of the circle , r is the radius
The given equation is
x² + y² + 4x – 14y + 46 = 0
x² +4x +4 -4 +y² -2.7y + 49-49+46 = 0
(x + 2)² + (y-7)² -4-49+46 = 0
(x + 2)² + (y-7)²= 7
Therefore the centre of the circle is (-2,7) and the radius is √7 ,
Therefore Option D is the right answer.
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for f(x)-4x+1 and g(x)-x^2-5, find (g/f) (x)
Answers
Answer:
A.
Step-by-step explanation:
let me know if you want an explanation :))
Answer:
A
Step-by-step explanation:
The boundary of a park is shaped like a circle. The park has a rectangular playground in the center and 2 square flower beds, one on each side of the playground. The length of the playground is l and its width is w. The length of each side of the flower beds is a. Which two equivalent expressions represent the total fencing material required to surround the playground and flower beds? Assume that the playground and beds do not overlap.
Answers
The total fencing material required to surround the playground of length l and width w and 2 flower beds of side a is 2 ( l + b ) + 8a units.
What is perimeter of square or rectangle?The perimeter of a two-dimensional shape is the total length of the outline.
Perimeter of rectangle = 2 ( l + b ).
Perimeter of square = 4 × side.
Given the length of the playground is l and its width is w and the length of each side of the flower beds is a.
The total fencing material required = perimeter of playground + 2 * Perimeter of flower bed.
= 2 ( l + w ) + 2 * 4a
= 2 ( l + w ) + 8a units.
Therefore, The total fencing material required to surround the playground and flower beds is 2 ( l + w ) + 8a units.
The question seems incomplete, its options could be:
2 ( l + w ) + 8a 2 ( l - w ) + 8a 2 ( l + w ) + 4a 2 ( l - w ) + 4aLearn more about perimeter here:
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Which expression is equivalent to √48x5, if x> 0?
A. 12x³√3x
B. 4x³√3
C. 4x²√3x
D. 12x²√
Answers
Answer:
C. 4x²√(3x)
Step-by-step explanation:
if x > 0
[tex]\sqrt{48x^{5}} =\sqrt{48} \times \sqrt{x^{5}}[/tex]
[tex]=\sqrt{16\times 3} \times \sqrt{x^{4}\times x}[/tex]
[tex]=\sqrt{16} \times \sqrt{3} \times \sqrt{x^{4}} \times \sqrt{x}[/tex]
[tex]=4\times \sqrt{3} \times \sqrt{\left( x^{2}\right)^{2} } \times \sqrt{x}[/tex]
[tex]=4\times \sqrt{3} \times x^{2}\times \sqrt{x}[/tex]
[tex]=4\times x^{2} \times \sqrt{3} \times \sqrt{x}[/tex]
[tex]=4\times x^{2}\times \sqrt{3x}[/tex]
its about efficiency in systems
Answers
.......................
A 400 second song is divided into three parts the beginning the middle and the end the beginning is one sixth as long as the end
Answers
The beginning, middle and end part of the song is 40, 120 and 240 seconds respectively
How to find equation of the unknownlet
x = end partBeginning = 1/6xMiddle = 1/2xTotal = 400 secondsx + 1/6x + 1/2x = 400
(6x+x+3x) / 6 = 400
10/6x = 400
x = 400 ÷ 10/6
x = 400 × 6/ 10
= 2400 / 10
= 240 seconds
Therefore,
End part = x
= 240 seconds
Beginning = 1/6x
= 1/6 × 240
= 40 seconds
Middle = 1/2x
= 1/2 × 240
= 120 seconds
Complete question:
The beginning is one sixth as long as the end. The middle is one half as long as the end. Find the length of each part
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I am not able to tackle this question. Somebody please help me out
The minimum load at which a certain kind of iron wire breaks can be supposed to define a random variable normally distributed with expected value 80N and standard deviation 3N. Find the probability that such a wire will break when the load is (a) 74N
(b)89N
Answers
The wire breaks if the load [tex]X[/tex] exceeds some amount. So what you're asked to do is find [tex]P(X\ge74)[/tex] and [tex]P(X\ge89)[/tex].
In either case, transform [tex]X[/tex] to the random variable [tex]Z[/tex] that's normally distributed with expected value 0 and standard deviation 1.
[tex]P(X\ge74) = P\left(\dfrac{X-80}3 \ge \dfrac{74-80}3\right) \\ = P(Z \ge -2) \\ = 1-P(Z < -2) \approx 0.9773[/tex]
[tex]P(X\ge89) = P\left(\dfrac{X-80}3 \ge \dfrac{89-80}3\right) \\= P(Z \ge 3) \\= 1 - P(Z < 3) \approx 0.0013[/tex]
The perimeter of an equilateral triangle is 9x + 3, this is greater than the perimeter of a
regular pentagon which is 10x - 5.
Write down an inequality to represent this information.
Answers
Answer:
x < 8
Step-by-step explanation:
9x + 3 > 10x - 5
9x - 10x > -5 - 3
-x > -8
x < 8
[tex] \bold{(10x - 6x³ + 8x²) - (5x² + 12x³ - 4)}[/tex]
Answers
Answer:
[tex]\boxed{\sf -18x^3+3x^2+10x+4}[/tex]
Explanation:
[tex]\rightarrow \sf (10x - 6x^3 + 8x^2) - (5x^2 + 12x^3 - 4)[/tex]
distribute
[tex]\rightarrow \sf 10x - 6x^3 + 8x^2 - 5x^2 - 12x^3 + 4[/tex]
collect terms
[tex]\rightarrow \sf -6x^3-12x^3+3x^2+10x+4[/tex]
add similar terms
[tex]\rightarrow \sf -18x^3+3x^2+10x+4[/tex]
Answer:
[tex]-18x^3+3x^2+10x+4[/tex]
Step-by-step explanation:
Given:
[tex](10x-6x^3+8x^2)-(5x^2+12x^3-4)[/tex]
Apply the rule (a) = a:
[tex]\implies 10x-6x^3+8x^2-(5x^2+12x^3-4)[/tex]
[tex]\textsf{Use the distributive law} \quad -(a+b)=-a-b:[/tex]
[tex]\implies 10x-6x^3+8x^2-5x^2-12x^3-(-4)[/tex]
Apply the rule -(-a) = a:
[tex]\implies 10x-6x^3+8x^2-5x^2-12x^3+4[/tex]
Collect like terms:
[tex]\implies -6x^3-12x^3+8x^2-5x^2+10x+4[/tex]
Combine like terms:
[tex]\implies -18x^3+3x^2+10x+4[/tex]
What is the equation of the line passing through the point (2,-4)
Answers
Answer:
y = m(x - 2) - 4
Step-by-step explanation:
Equation of a straight line is given by;
y = mx + c
Take a point on the line (x, y) and the given point (2, -4)
gradient = change x/ change in y
gardient(m) = y +4/ x - 2
m(x-2) = y + 4
y = m(x - 2) - 4
Calcular la edades actuales de una madre y sus dos hijos sabiendo que hace 14 años la dad de la madre era 5
veces la suma de las edades de los hijos en aquel momento, que dentro de 10 madre será la suma de las edades
que los hijos tendrán en ese momento y que cuando el hijo mayor tenga la edad actual de la madre, el hijo
menor tendrá 42 años.
Answers
The present age of mother and her daughter respectively are; 40 and 10 years respectively.
How to Solve Algebra Word Problems?Let x and y be the present age of mother and her daughter respectively.
Therefore;
x + y = 50
x = 50 − y .....(1)
After 20 years, mother's age will be twice her daughter's age at the time. Thus;
x + 20 = 2(y + 20)
x − 2y = 20 .....(2)
Plugging eq 1 into eq 2 gives us;
50 − y − 2y = 20
3y = 30
y = 10
Thus;
x = 50 − 10
x = 40
Thus, the present age of mother and her daughter is 40 and 10 years respectively.
Translation of the question into English is;
The sum of the present ages of mother and her daughter is 50 years. After 20 years, mother's age will be twice her daughter's age at the time. Find their present ages.
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A media personality argues that global temperatures are not rising, because every year an increase is reported, such as 0.09 degrees C. The difference from the previous year is less than the margin of error of about 0.13 degrees C, so that difference should be ignored. What is the best counterargument?
The difference is only 0.04, but that is still a significant change.
The margin of error is quite small compared to the change year over year, so it is a significant issue.
The change of 0.09 is not a lot and thus should be ignored.
The margin of error is larger than the increase, so we should consider it an issue of just extra information and thus can be ignored.
Answers
The correct option would be The margin of error is quite small compared to the change year over year, so it is a significant issue option third is correct.
What is the margin of error(MOE)?It is defined as an error that provides an estimate of the percentage of errors in real statistical data.
The formula for finding the MOE:
[tex]\rm MOE = Z\times \dfrac{s}{\sqrt{n}}[/tex]
Where Z is the z-score at the confidence interval
s is the standard deviation
n is the number of samples.
We have:
A media personality argues that global temperatures are not rising, because every year an increase is reported, such as 0.09 degrees C.
As the value of MOE is 0.13 degrees
It is a serious problem because the margin of error is quite narrow in comparison to the shift from year to year.
Thus, the correct option would be The margin of error is quite small compared to the change year over year, so it is a significant issue option third is correct.
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f(x) = x². What is g(x)?
Answers
g(x) is the inverse of f(x)
[tex]f(x) = {x}^{2} [/tex]
[tex]g(x) = \sqrt{x} [/tex]
The reciprocal of 15 is
1.
Answers
Answer:
1/15 is the answers for the question
Step-by-step explanation:
please mark me as brainlest
How much is Bob's net salary for the week? Question 32
Answers
Answer:
A. $152.00
Step-by-step explanation:
I'm 99% sure the net salary is just the 220 (gross salary) minus everything else taken away which is (42 + 7 + 15 + 4) = 68. 220 - 68 = 152 so Bob's net salary would be 152
(7 x 10 ^5) + (4 x 10 ^2)
Answers
[tex]\huge\text{Hey there!}[/tex]
[tex]\mathsf{(7\times 10^5) + (4 \times 10^2)}\\\mathsf{= 7\times 10^5 + 4 \times 10^2}[/tex]
[tex]\large\textsf{Let's solve for the LEFT SIDE first}[/tex]
[tex]\mathsf{7\times 10^5}\\\\\mathsf{10^5}\\\mathsf{= 10\times10\times10\times10\times10}\\\mathsf{= 100 \times 100\times 10}\\\mathsf{= 10,000 \times 10}\\\mathsf{= 100,000}\\\\\mathsf{7\times100,000}\\\mathsf{= 700,000}[/tex]
[tex]\large\textsf{NEW EQUATION: }\bold{700,000} + {4}\times 10^2[/tex]
[tex]\large\textsf{Now, let's solve for the RIGHT SIDE last}[/tex]
[tex]\mathsf{4\times 10^2}\\\\\mathsf{10^2}\\\mathsf{= 10\times10}\\\mathsf{= 100}\\\\\mathsf{4\times100}\\\mathsf{= 400}[/tex]
[tex]\large\text{NEW EQUATION: 700,000 + \bf 400}[/tex]
[tex]\large\text{700,000 + 400}\\\\\large\text{SIMPLIFY IT!}\\\\\large\text{= 700,400}[/tex]
[tex]\huge\text{Therefore, the answer should be: \boxed{\mathsf{700,400}}}\huge\checkmark[/tex]
[tex]\huge\text{Good luck on your assignment \& enjoy your day!}[/tex]
~[tex]\frak{Amphitrite1040:)}[/tex]
Find the slope of the line passing through the points (-5, -3) and (0, -4).
Answers
Answer:
To find the slope:
[tex]\frac{(y_{1} - y_{2})}{(x_{1} - x_{2})} =\frac{(-3-(-4))}{(-5-0)} =\frac{1}{-5}[/tex]
Hope it helps!
What are the possible values of xin 8x² + 4x=-1?
Answers
Answer:
hey
Step-by-step explanation:
4
Answer:
(-½,0)
Step-by-step explanation:
please mark me brainliest
How would you classify the following expression by the number of terms?
42−8+4
Solution
First, consider how many terms are in the expression.
This expression has ______ terms.
Therefore, this expression is called a trinomial.
Classify the expression by the number of terms: 43−8
Solution
First, consider how many terms are in the expression.
This expression has ____ terms.
The answer is a ______. (monomial, binomial, or trinomial)
Classify the expressions by the number of terms.
2+3+9 = (monomial, binomial, polynomial or trinomial)
6= (monomial, binomial, polynomail or trinomial)
Answers
Answer:
1. This expression has 3 terms.
2. This expression has 2 terms
3. Solution 43-8=35
3. binomial
2+3+9= trinomial
6=monomial
Step-by-step explanation:
Identify each pair of angles as corresponding, alternate interior, alternate exterior, same-side interior, vertical, or adjacent
Answers
1) Alternate exterior
2) Corresponding
3) Alternate exterior
4) Alternate exterior
5) Vertical
6) Corresponding
7) Adjacent
8) Corresponding
9) Corresponding
10) Alternate interior
4
Which are correct representations of the inequality 6x ≥ 3 + 4(2x - 1)? Select three options.
01 ≥ 2x
O
O
6x ≥ 3 + 8x - 4
-1.5
-1.5
0- -1.5
-1
-1
-1
-0.5
-0.5
-0.5
0
0
0
0.5
0.5
0.5
1
1
1.5
1.5
1.5
Answers
Answer:
6x > 3+4(2x -1)
6x > 3+ 8x - 4
6x > (-1) + 8x
6x - 6x > (-1) + 8x - 6x
subtracting 6x from both sides
0 > 2x - 1
adding +1 on both sides
1 > 2x
1/2 > x
x < 1/2
The correct representations of the inequality 6x ≥ 3 + 4(2x - 1) is,
⇒ x ≤ 1/2
What is mean by Inequality?A relation by which we can compare two or more mathematical expression is called an inequality.
We have to given that;
The inequality is,
⇒ 6x ≥ 3 + 4(2x - 1)
Now, We can simplify as;
⇒ 6x ≥ 3 + 4(2x - 1)
⇒ 6x ≥ 3 + 8x - 4
⇒ 6x ≥ 8x - 1
⇒ 1 ≥ 8x - 6x
⇒ 1 ≥ 2x
⇒ x ≤ 1/2
Thus, The correct representations of the inequality 6x ≥ 3 + 4(2x - 1) is,
⇒ x ≤ 1/2
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Question is in attached file
Answers
The rate of the passenger train is 81.67 MPH and the rate of the freight train is 66.67 MPH.
What is a linear equation?It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.
If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.
We have:
The distance traveled by passenger train = 245 miles
The distance traveled by freight train = 245 miles
The time takes for both trains is the same.
Let's suppose the rate of the passenger train is x and the rate of the freight train is y;
As we know,
Distance = speed×time
245/x = 200/y
200x = 245y
200x - 245y = 0 ..(1)
x = 15 + y ..(2)
Equations (1) and (2) represent the situation.
After solving equations (1) and (2):
[tex]\rm x=\dfrac{245}{3}= 81.67\\\\\\\:y=\dfrac{200}{3}=66.67[/tex]
Thus, the rate of the passenger train is 81.67 MPH and the rate of the freight train is 66.67 MPH.
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Which polynomial represents the sum below?
(4x²+1)+(4x² + x + 2)
A. 16x²+x+2
B. 8x²+x+2
C. 16x²+x+3
D. 8x²+x+3
Answers
Answer: D. 8x² + x + 3
Sum means the answer to an addition problem. To find the sum of polynomials, we will add like terms.
What are like terms?Like terms can be combined using addition or subtraction and have the same variables. Constants are also like terms with each other because they have no variables.
Solve(4x² + 1) + (4x² + x + 2) Starting equation from the question
= 4x² + 1 + 4x² + x + 2 Remove brackets
= 4x² + 4x² + x + 1 + 2 Rearrange to group like terms together
= 8x² + x + 1 + 2 Add like terms with the same 'x²' variables
= 8x² + x + 3 Add like terms that are constants
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For each of the following research questions, determine whether an observational study, an
experiment, or neither should be used to answer the question. Note - each term on the right may be
used more than once or not at all.
Answers
The situations described can be classified as experiment, and observational study.
What is an experiment?An experiment is a tool to test a hypothesis about the occurrence of a particular phenomenon. According to the above, it can be stated that student-centered instruction can be classified as an experiment because this method of education is used and it is verified whether it is effective or not.
What is an observational study?An observational study is a methodology to identify the occurrence of an event in a particular situation. From the foregoing, it can be inferred that the participation of women in the 2016 election is the product of an observational study because only the number of voters should be counted and the number of women who participated should be identified.
Note: This question is incomplete because there is some information missing. Here is the information missing.
OPTIONS:
Does learner-centered instruction increase students' success rates in maths?
What proportion of registered women voters voted in the 2016 U.S. presidential election?
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Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.54 and a standard deviation of 0.42. Using the empirical rule, what percentage of the students have grade point averages that are less than 2.96? Please do not round your answer.
Answers
Using the Empirical Rule, it is found that 84% of the students have grade point averages that are less than 2.96.
What does the Empirical Rule state?It states that, for a normally distributed random variable:
Approximately 68% of the measures are within 1 standard deviation of the mean.Approximately 95% of the measures are within 2 standard deviations of the mean.Approximately 99.7% of the measures are within 3 standard deviations of the mean.In this problem, 2.96 is one standard deviation above the mean. We have that:
The normal distribution is symmetric.Of the 50% of the measures below the mean, all are below 2.96.Of the 50% of the measures above the mean, 68% are below 2.96.Hence the percentage is given by:
P = 50% + 0.68 x 50% = 50% + 34% = 84%.
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