The utility maximizing units of consumption are approximately 1 or 15 units, depending on other factors such as budget constraints and the specific preferences of the individual.
To find the utility maximizing units of consumption, we need to calculate the first derivative of the utility function (U) with respect to q and set it equal to zero. Here's the utility function:
U = 18q + 7q^2 - (1/3)q^3
Now, we'll find the first derivative (dU/dq):
dU/dq = 18 + 14q - q^2
To find the utility maximizing units, set dU/dq to zero and solve for q:
0 = 18 + 14q - q^2
Rearrange the equation:
q^2 - 14q + 18 = 0
Now, we'll solve for q using the quadratic formula:
q = (-b ± √(b^2 - 4ac)) / 2a
In this case, a = 1, b = -14, and c = 18. Plug these values into the formula:
q = (14 ± √((-14)^2 - 4 * 18)) / 2
q = (14 ± √(196 - 72)) / 2
q = (14 ± √124) / 2
The two possible solutions for q are:
q1 ≈ 1.27
q2 ≈ 14.73
Since the individual consumes discrete units, the utility maximizing consumption will be the whole number closest to these values.
Therefore, the utility maximizing units of consumption are approximately 1 or 15 units, depending on other factors such as budget constraints and the specific preferences of the individual.
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A plane rose from take-off and flew at an angle of 11° with the ground. When it reached an
altitude of 500 feet, what was the horizontal distance the plane had flown?
A plane rose from take-off and flew at an angle of 11° with the ground, the horizontal distance the plane had flown when it reached an altitude of 500 feet is approximately 2755.3 feet.
To solve this problem, we can use trigonometry. We know that the angle between the ground and the plane's path is 11°, and the altitude of the plane is 500 feet. Let x be the horizontal distance the plane has flown.
We can use the tangent function, which is defined as the ratio of the opposite side to the adjacent side of a right triangle, to find x. In this case, the opposite side is the altitude (500 feet) and the adjacent side is x. So we have:
tan(11°) = 500/x
To solve for x, we can multiply both sides by x and then divide by tan(11°):
x = 500 / tan(11°)
Using a calculator, we get:
x ≈ 2755.3 feet
Therefore, the horizontal distance the plane had flown when it reached an altitude of 500 feet is approximately 2755.3 feet.
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Jacinta compares the volume of two boxes. Both boxes have a width of 2. 5 inches, and a height of 10 inches. The larger box has a length of 8 inches. The smaller box has a length that is 75 % of the length of the larger box.
Volume of large box =
Volume of small box =
What is the difference in the volumes of the two boxes?
Which units should be used for each of these answers?
The volume of the larger box is 200 cubic inches, and the volume of the smaller box is 150 cubic inches.
To find the volume of each box, we use the formula for the volume of a rectangular prism, which is V = lwh, where l is the length, w is the width, and h is the height.
For the larger box, we have l = 8 inches, w = 2.5 inches, and h = 10 inches, so
Volume of large box = = 8 x 2.5 x 10 = 200 cubic inches.
For the smaller box, we have l = 0.75 x 8 = 6 inches, w = 2.5 inches, and h = 10 inches, so
Volume of small box= 6 x 2.5 x 10 = 150 cubic inches.
The difference in the volumes of the two boxes is
Volume of large box - Volume of small box = 200 - 150 = 50 cubic inches.
The units for the volumes are cubic inches, since we are dealing with three-dimensional space.
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Select the correct answer.
Which is the minimum or maximum value of the given function?
of
44 N₂
O A.
OB.
O.C. The function has a minimum value of -4.
OD. The function has a maximum value of -4.
The function has a minimum value of -3.
The function has a maximum value of -3.
Answer:
C
Step-by-step explanation:
The lowest point on the graph on the y-axis is -4
Worth 50 points!!! a ball is dropped from a height of 32 meters. with each bounce, the ball reaches a height that is half the height of the previous bounce. after which bounce will the ball rebound to a maximum height of 25 centimeters?
The ball will rebound to maximum height of 25 centimetres or 0.25 meters after 7 bounces.
Firstly perform the unit conversion. As known, 1 meter is 100 cm. So, 25 centimetres is 0.25 meters.
Now, the formula to be used to find the number of bounces is -
New height × [tex] {2}^{n} [/tex] = old height, where n refers to number of bounces.
Keeping the values in formula
0.25 × [tex] {2}^{n} [/tex] = 32
Rearranging the equation
[tex] {2}^{n} [/tex] = 32/0.25
Divide the values
[tex] {2}^{n} [/tex] = 128
Converting the result into exponent form
[tex] {2}^{n} [/tex] = 2⁷
Thus, n will be 7 bounces.
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Use your mouse or finger to split the
trapezoid into two triangles and a rectangle.
I ready
Trapezoids can be split into two triangles and a rectangle.
Trapezoid is also known as a trapezium which is a closed shape having 4 sides with one pair of parallel sides. Trapezium is quadrilateral with 4 sides The parallel sides of a trapezium are known as the bases, and its non-parallel sides are called legs. A trapezium can also have parallel legs. The parallel sides can be horizontal, vertical, or slanting. Few real-life objects example of trapezium is a lamp, popcorn box etc.
A trapezoid consists of two triangles and one rectangle figure shows how can we cut the trapezium to split the trapezium.
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The likelihood that a child will attend a live musical performance can be modeled by
q = 0.01(0.0005x2 + 0.38x + 35) (15 ≤ x ≤ 100).
Here, q is the fraction of children with annual household income x thousand dollars who will attend a live musical performance during the year. Compute the income elasticity of demand E at an income level of $30,000. (Round your answer to two significant digits.)
E =
Interpret the result.
At a family income level of $_______ , the fraction of children attending a live musical performance is increasing by ________% per 1% increase in household income.
E = 0.01(0.0005(30)^2 + 0.38(30) + 35)(2*0.0005(30) + 0.38) ≈ 0.63
Interpretation: The income elasticity of demand is 0.63, which means that for every 1% increase in household income, the fraction of children attending a live musical performance increases by 0.63%.
At a family income level of $30,000, the fraction of children attending a live musical performance is increasing by 0.63% per 1% increase in household income.
To compute the income elasticity of demand E at an income level of $30,000, we need to find the derivative of q with respect to x, and then evaluate it at x=30. The derivative of q with respect to x is:
dq/dx = 0.01(0.001x + 0.38)
Now, let's evaluate this derivative at x=30:
dq/dx = 0.01(0.001(30) + 0.38) = 0.004
To calculate the income elasticity of demand E, we use the formula:
E = (dq/dx)(x/q)
First, let's find q at x=30:
q = 0.01(0.0005(30)^2 + 0.38(30) + 35) = 0.178
Now, we can find E:
E = (0.004)(30/0.178) ≈ 0.67
Interpret the result:
At a family income level of $30,000, the fraction of children attending a live musical performance is increasing by approximately 67% per 1% increase in household income.
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In ΔOPQ, p = 9. 5 inches, q = 7. 6 inches and ∠O=31°. Find the area of ΔOPQ, to the nearest 10th of a square inch
The area of ΔOPQ is approximately 18.9 square inches, rounding off to nearest 10th.
To find the area of ΔOPQ, we can use the formula:
Area = (1/2) * base * height
We know that p = 9.5 inches, q = 7.6 inches, and ∠O = 31°.
Now, using trigonometry the height h of the triangle can be found using the sin function.
sin(θ) = perpendicular/hypotenuse
perpendicular = hypotenuse* sin(θ)
= 7.6 * sin(31°)
≈ 3.98 inches
Now, we can use the formula for the area:
Area = (1/2) * base * height
Putting in the values, we get:
Area = (1/2) * 9.5 * 3.98
Area ≈ 18.93 square inches
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The ratio of boys to girls in mrs. Cunninghams class is 2 to 3, there are 18 girls in the class. What is the total number of students in mrs. Cunninghams class
The total number of students in Mrs. Cunningham's class is 30.
From the question we know that the ratio of boys to girls in Mrs. Cunningham's class is 2 to 3 so we can write
no.of boys: no.of girls = 2:3
The total number of girls in the class is given as 18 so with this we can find out the number of boys in the class that is :
no.of boys= (2/3)*no.of girls in class
now after substituting the values in the equation, we get
no. of boys = (2/3) * 18
no.of boys = 12.
So, now we know the number of boys in the class that is 12 and the number of girls in the class is 18.
We can calculate the total number of students in the class which is equal to
= no.of boys + no.of girls.
= 12+18
=30
Therefore, the total number of students in Mrs. Cunningham's class is 30.
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If KN = 3 cm, MN = 7 cm, RS = 14 cm, and PS = 6 cm, what is the scale factor of figure KLMN to figure PQRS?
The scale factor of figure KLMN to figure PQRS is 6 cm / 3 cm = 2.
To find the scale factor of figure KLMN to figure PQRS, given KN = 3 cm, MN = 7 cm, RS = 14 cm, and PS = 6 cm, follow these steps:
1. First, find the length of a side in figure KLMN. We can use KN since it's given: KN = 3 cm.
2. Next, find the corresponding side length in figure PQRS. Since KN corresponds to PS, we have: PS = 6 cm.
3. Now, find the scale factor by dividing the length of the side in figure PQRS by the length of the corresponding side in figure KLMN: scale factor = PS/KN = 6 cm / 3 cm.
The scale factor of figure KLMN to figure PQRS is 6 cm / 3 cm = 2.
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How much interest has accrued after one month at a rate of 15. 5%? Use the formula I=Prt. *
A $19. 24
B $18. 71
C $18. 81
The interest accrued after one month at a rate of 15.5% on a principal amount of $1,000 is $12.92.
To use the formula I=Prt to calculate the interest accrued after one month at a rate of 15.5%, we need to know the principal amount (P) and the time period (t) in years.
Assuming that the principal amount is $1,000, and the time period is one month, which is equivalent to 1/12 of a year, we can calculate the interest as follows:
[tex]I = Prt[/tex]
[tex]I[/tex] [tex]= 1000 x 0.155 x (1/12)[/tex]
[tex]I = $12.92[/tex]
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Consider triangle ABC with vertices A(0,0), B (0,6), and C (4,0). The image of triangle ABC after a dilation has vertices A'(0,0), B' (0,21), and C' (14,0).
What is the scale factor of the dilation?
k = ?
Answer:
k=0.3
Step-by-step explanation:
Let's call the length of each of the other two sides x. Since the triangle is isosceles, it has two sides of equal length. Therefore, the perimeter of the triangle can be expressed as 6 + x + x Simplifying this equation, we get 2x + 6 We know that the perimeter is 22 cm so we can set up an equation and solve for x. 22 = 2x + 6 Subtracting 6 from both sides, we get 16 = 2x Dividing both sides by 2, we get x=8
How do i solve this?
RSQ= 126 degrees
both angles are cooresponding angels therefore
5x+86=10x+46
86-46=10x-5x
40=5x
x=8
substitute
10(x)+46
10(8)+46
80+46
126
Explain why a runner completes a 6.2 mi race in 32 min , then he must be running 11m/hr at the entire race
The runner's average speed is approximately 11.63 mph, which is slightly faster than 11 mph. So, the runner doesn't maintain exactly 11 mph throughout the entire race, but they are close.
If a runner completes a 6.2 mile race in 32 minutes, we can calculate their average speed by dividing the total distance by the total time.
6.2 miles ÷ 32 minutes = 0.194 miles per minute
To convert this to miles per hour, we need to multiply by 60 (the number of minutes in an hour):
0.194 miles per minute x 60 minutes = 11.63 miles per hour
So the runner must be running at an average speed of 11.64 miles per hour throughout the entire race in order to complete it in 32 minutes. This is an impressive pace and shows that the runner is very fit and capable of sustaining a fast speed for a relatively long distance.
A runner completes a 6.2-mile race in 32 minutes, and we are to determine if they maintain an 11 mph pace throughout the race. To do this, we need to convert the race time to hours and then divide the race distance by the time.
First, convert 32 minutes to hours:
32 minutes / 60 minutes/hour = 0.5333 hours
Next, calculate the average speed:
6.2 miles / 0.5333 hours ≈ 11.63 mph
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On a unit circle, the terminal side of Angle 0 intersects the circle at point (x,y). ?
Underline the expressions that would make the following statements true.
A) sin θ = (x,y, the ratio of x to y, the ratio of y to x)
B) tan θ = (x,y, the ratio of x to y, the ratio of y to x)
C) cos θ = (x,y, the ratio of x to t, the ratio of y to x)
The correct expressions are:
A) sin θ = y
B) tan θ = y/x
C) cos θ = x
How On a unit circle, the terminal side of Angle 0 intersects the circle at the point?On a unit circle, the terminal side of Angle 0 intersects the circle at points (x,y). We can use trigonometric ratios to relate the coordinates (x,y) to the angle θ.
A) sin θ = the ratio of y to 1, or simply y.
B) tan θ = the ratio of y to x.
C) cos θ = the ratio of x to 1, or simply x.
Therefore, the correct expressions are:
A) sin θ = y
B) tan θ = y/x
C) cos θ = x
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Can I have help with this question, Please?
"Write an equation for the ellipse."
Center: (1, -3)
The equation of the ellipse with center (1, -3), and a semi major axis of 4, and a semi minor axis of 3 is; (x - 1)²/4² + (y + 3)²/3²
What is the standard form of the equation of an ellipse?The standard form equation of an ellipse can be presented as follows;
(x - h)²/a² + (y - k)²/b² = 1
Where;
(h, k) = The coordinates of the center of the ellipse.
The length of the semi major axis = a
Length of the semi minor axis = b
The center of the specified ellipse is; (h, k) = (1, -3)
The semi major axis = 4
The length of the semi minor axis = 3
The equation of the ellipse is therefore;
(x - 1)²/4² + (y - (-3))²/3² = 1
(x - 1)²/4² + (y + 3)²/3² = 1
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This mysterious hand went to the mall and saw a massage chair
that he would have to take a loan out to purchase. The total of the
loan was $6600. The bank said that he could get a simple interest
rate of 8% for 5 years. What is the total amount that the mysterious
hand will pay for the chair?
Since the loan is at a simple interest rate of 8% for 5 years, the total amount that the mysterious hand will pay is:
Total amount = Principal + Interest
where Principal is the initial amount of the loan, and Interest is the amount of interest charged on the loan.
The interest charged on the loan can be calculated using the simple interest formula:
Interest = Principal x Rate x Time
where Rate is the interest rate per year, and Time is the time period in years.
Plugging in the given values, we get:
Interest = 6600 x 0.08 x 5 = 2640
So the total amount that the mysterious hand will pay is:
Total amount = 6600 + 2640 = 9240
Therefore, the total amount that the mysterious hand will pay for the massage chair is $9,240.
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30 % of a number is 14.99 . Set up an equation and solve to find the original number
Answer:
The original number is approximately 49.97.--------------------
Let the original number be n.
We are given that 30% of n is 14.99.
Set up an equation to reflect this relation:
30% of n = 14.99Solve it for n:
0.3*n = 14.99n = 14.99/0.3n = 49.97 (rounded)Question content area top
Part 1
A riverboat travels 69 km downstream in 3 hours. It travels 76 km upstream in 4 hours. Find the speed of the boat and the speed of the stream.
The speed of the boat is 21 km/h and the speed of the stream is 2 km/h.
Camden and violet are reading the same book. at the beginning of the month, camden was on page 18 and violet was on page 39. camden will read 11 pages per day and violet will read 8 pages per day. let c represent the page of the book that camden is on at the end of t days into the month. write an equation for each situation, in terms of t. and determine whether camden or violet is farther along in 2 days.
For Camden the equation is c = 18 + 11t and for Violet the equation is v = 39 + 8t. After 2 days, Camden will be on page 40 and Violet will be on page 55.
Let's represent the situation with two equations, one for Camden (c) and one for Violet (v), using the given information and the variable t for the number of days.
Camden:
At the beginning of the month, Camden was on page 18 and will read 11 pages per day. So, his equation will be:
c = 18 + 11t
Violet:
At the beginning of the month, Violet was on page 39 and will read 8 pages per day. So, her equation will be:
v = 39 + 8t
Now, we need to determine who is farther along in the book after 2 days. To do this, we will substitute t = 2 into both equations.
Camden's equation (c):
c = 18 + 11(2)
c = 18 + 22
c = 40
Violet's equation (v):
v = 39 + 8(2)
v = 39 + 16
v = 55
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Given the following practical problem, what is the slope of the linear function?
Homer walked to school every day. He walked at a pace of 4 miles per hour
The slope of the linear function representing Homer's walking pace is 4 miles per hour.
How can the slope of Homer's linear function be determined?In the given practical problem, we are told that Homer walked to school at a pace of 4 miles per hour. The slope of the linear function can be determined by considering the relationship between the distance he walked and the time it took.
In this case, the slope represents the rate of change of distance with respect to time, which is equal to the speed at which Homer is walking. Since Homer's pace is given as 4 miles per hour, the slope of the linear function representing his distance as a function of time would be 4.
Therefore, the slope of the linear function in this practical problem is 4, indicating that for every hour that passes, Homer walks 4 miles.
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At the beginning of the summer, a camp has 540 campers and 36
counselors. part a: by midsummer, an additional 0 campers join the camp. how many additional counselors are needed to keep the same ratio of campers to counselors? write a proportion and solve. part b: by the end of the summer, 2/3 of the campers plan to come back next year. how many campers can they expect back next year? write a proportion and solve. part c: how many counselors will they need next year for the estimated returning campers? write a proportion and solve.
The camp would need 24 counselors for the estimated returning campers.
Midsummer is typically around the middle of the summer season, which is usually around the end of July. In this scenario, at the beginning of the summer, there are 540 campers and 36 counselors at a camp.
Part a asks us to determine how many additional counselors are needed to maintain the same ratio of campers to counselors if 0 additional campers join the camp by midsummer.
To solve this problem, we can set up a proportion:
540 campers / 36 counselors = (540 + 0) campers / x counselors
We can simplify this proportion by cross-multiplying and solving for x:
540x = 36(540 + 0)
x = 36(540 + 0) / 540
x = 36
Therefore, the camp would need an additional 36 counselors to maintain the same ratio of campers to counselors if no additional campers joined by midsummer.
Part b asks us to determine how many campers can be expected to return the following year if 2/3 of the current campers plan to come back. We can set up a proportion for this problem as well:
2/3 (current campers) = x (expected returning campers) / 540 (current campers)
We can solve for x by cross-multiplying and simplifying:
2/3 (540) = x
x = 360
Therefore, the camp can expect around 360 campers to return the following year.
Part c asks us to determine how many counselors will be needed for the estimated returning campers. We can set up a proportion once again:
540 (current campers) / 36 (current counselors) = 360 (expected returning campers) / x (needed counselors)
We can solve for x by cross-multiplying and simplifying:
540x = 36(360)
x = 24
Therefore, the camp would need 24 counselors for the estimated returning campers.
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3 cm
H
8 cm
12 cm
What is the volume of the table tent?
The volume of the table tent 3 cmH8 cm12 cm is 288 cubic cm.
How to determine the volume of the table tentThe volume of the table tent can be found by multiplying the length, width, and height of the tent.
Volume = length x width x height
In this case, the length is 12 cm, the width is 8 cm, and the height is 3 cm.
Volume = 12 cm x 8 cm x 3 cm
Volume = 288 cubic cm
Therefore, the volume of the table tent is 288 cubic cm.
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11. On a basketball court, the free throw lane is marked off geometrically. This area of the court is called the
key and is topped by a semicircle that has a diameter of 12 feet. Find the arc length of the semicircle to the
nearest foot. Find the area of the semicircle to the nearest square foot.
The area of the semicircle is approximately 57 square feet.
The arc length of the semicircle can be found using the formula:
arc length = (θ/360) × 2πr
where θ is the angle in degrees, r is the radius, and π is approximately 3.14.
In this case, the diameter of the semicircle is 12 feet, so the radius is half of that, or 6 feet. The angle of the semicircle is 180 degrees, since it is a semicircle. Plugging these values into the formula, we get:
arc length = (180/360) × 2π(6) ≈ 18.85 feet
Therefore, the arc length of the semicircle is approximately 19 feet.
To find the area of the semicircle, we can use the formula:
area = (πr^2)/2
Plugging in the value of the radius from before, we get:
area = (π(6^2))/2 ≈ 56.55 square feet
Therefore, the area of the semicircle is approximately 57 square feet.
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a teacher has an annual salary of 98,500. how much does that teacher make biweekly?
If a teacher has an annual salary of 98,500, the teacher makes $947.12 per biweekly period.
To calculate the teacher's biweekly salary, we need to divide their annual salary by the number of weeks in a year, and then divide that result by 2 (since there are 2 weeks in a biweekly period).
There are a few different ways to approach this calculation, but one common method is to use the following formula:
Biweekly Salary = (Annual Salary / Number of Weeks in a Year) / 2
Using this formula, we can calculate the teacher's biweekly salary as follows:
Biweekly Salary = (98,500 / 52) / 2
Biweekly Salary = (1,894.23) / 2
Biweekly Salary = 947.12
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The histogram shows the number of people who viewed each showing of scary night at one movie theater during its opening week the seat capacity of the theater is 300 for what fraction of the shows was the theater half full or less than half explain
For approximately 64% of the shows, the theater was half full or less than half full.
Since the seat capacity of the theater is 300, half full would be 150 seats or less. Looking at the histogram, we can see that there are 3 bars representing showings with 150 or less viewers.
The first bar represents showings with 0-50 viewers. From the histogram, it looks like there were about 5 showings with this number of viewers.
The second bar represents showings with 50-100 viewers. From the histogram, it looks like there were about 8 showings with this number of viewers.
The third bar represents showings with 100-150 viewers. From the histogram, it looks like there were about 3 showings with this number of viewers.
So the total number of showings with 150 or less viewers is 5+8+3 = 16.
Since the histogram shows a total of 25 showings, the fraction of shows that was half full or less than half is:
16/25 = 0.64 or 64%
Therefore, for approximately 64% of the shows, the theater was half full or less than half full.
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EMERGENCY HELP NEEDED!! WILL MARK BRAINLIEST!!!
f (X) = 2X + 3
g (X) = 3X + 2
What does (F + G) (X) equal
Answer:
To find (f + g)(x), we need to add the two functions f(x) and g(x), and then evaluate the sum at x.
So, we have:
(f + g)(x) = f(x) + g(x)
Substituting the given functions, we get:
(f + g)(x) = (2x + 3) + (3x + 2)
Simplifying the expression, we get:
(f + g)(x) = 5x + 5
Therefore, (f + g)(x) is equal to 5x + 5.
Two sides of a parallelogram are 9. 5 feet and 6. 1 feet. The measure of the angle between these sides is 20°. Find the area of the parallelogram to the nearest 10th of a square foot
The area of the parallelogram is approximately 21.2 square feet, rounded to the nearest tenth of a square foot.
To find the area of a parallelogram, we need to multiply the base by the height. In this case, the two sides given (9.5 feet and 6.1 feet) are the base and height respectively, because they are perpendicular.
To find the area, we first need to find the length of the other two sides. Since a parallelogram has opposite sides that are equal in length, we know that the other two sides are also 9.5 feet and 6.1 feet.
Next, we can use the given angle (20°) to find the height of the parallelogram. We can use trigonometry, specifically the tangent function, to do this:
tan(20°) = height / 6.1 feet
height = 6.1 feet * tan(20°)
height ≈ 2.23 feet
Now we can find the area:
area = base * height
area = 9.5 feet * 2.23 feet
area ≈ 21.185 square feet
Rounding to the nearest tenth of a square foot, the area is approximately 21.2 square feet.
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17/3 yd = how many ft
Answer:
w
Step-by-step explanation:
w
π8
radians is the same as
degrees.
Answer:
π/8 radians is the same as 22.5°
Step-by-step explanation
π corresponds to 180 degrees.
so
180 : 8 = 22.5°
Keisha's teacher gives her the following information: • m, n, p, and q are all integers and p = 0 and q + 0 m and B= 4 What conclusion can Keisha make? A + B = so the sum of two rational numbers is a rational number. AB= so the product of two rational numbers is a rational number. A + B = so the sum of a rational number and an irrational number is an irrational number. A. BE so the product of two irrational numbers is an irrational number.
Option C is correct i.e. A+B= (mp + nq)/pq, so the sum of two rational numbers is a rational number.
Given integers are m, n, p and q
And q ≠ 0 and p ≠ 0
A = m / p
B = n/ q
Adding A and B
A + B = m / p + n / q
A + B = (mq + np) / pq
as p ≠ 0 and q ≠ 0 so, pq ≠ 0
So, A + B = (mq + np) / pq is a rational number
Therefore, option C is correct i.e. A+B= (mp + nq)/pq, so the sum of two rational numbers is a rational number.
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Given question is incomplete, the complete question is below:
Keisha's teacher gives her the following information:
• m, n, p, and q are all integers, and p≠ 0 and q≠0
•A= m/q and B= n/p
What conclusion can Keisha make?
A: A +B = (mp + nq)/pq, so the sum of a rational number and an irrational number is an irrational number.
B: A•B= (mp + nq)/pq, so the product of two irrational numbers is an irrational number.
C: A+B= (mp + nq)/pq, so the sum of two rational numbers is a rational number.
D: A•B= (mp + nq)/pq, so the product of two rational numbers is a rational number.
