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RSB [31]
3 years ago
10

Evaluate the expression when a=9. 2a2

Mathematics
2 answers:
NemiM [27]3 years ago
8 0
36 because 9x2 is 18 and 18x2 is 36
guapka [62]3 years ago
5 0

Answer:

36

Step-by-step explanation:

Substitute the A for the 9, since A=9, and multiply the numbers

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4) The area of a piece of pie in the shape of a sector is 7.1 in. The angle of the sector is 40°. Find the diameter of
elixir [45]

Answer:

Step-by-step explanation:

Area of sector = angle/360 * pi * r^2

7.1 = 40/360 * 22/7 * r^2

7.1 = 1/9 * 22/7 * r^2

63.9 = 22r^2/7

r^2 = (7 * 63.9)/22

r^2 = 20.331818181818

r = square root of 20.331818181818

r = 4.51

d = r * 2 = 4.51 * 2 = 9.02

4 0
3 years ago
Is this relations a function? Justify your answer. ​
n200080 [17]

Answer:

A

Step-by-step explanation:

There need to be more matching points, but there aren't, therefore, its A

4 0
3 years ago
Read 2 more answers
Match the surfaces with the verbal description of the level curves by placing the letter of the verbal description to the left o
irakobra [83]

Answer:

Step-by-step explanation:

1. (2/z)x^2 + (3/z)y^2 is an equation for an ellipse, so the answeris A.

2. We can rewrite this as x^2 + y^2 = 25 - z^2. This is theequation for a circle, so the level curves are circles. However,they are unevenly spaced, because the radius of each circle issqrt(25-z^2). So the answer is F.

3. Rewriting, we have y = z/x. This is the equation of a hyperbola(except when z = 0). So the answer is B.

4. Rewriting, we have x^2 + y^2 = z^2. This is the equation for acircle of radius z, so the level curves are evenly spaced circles.The answer is C.

5. Solving for x, we have x = 1 + 1/z. These level curves arevertical lines, which are obviously parallel. However, they areunequally spaced, since the distance between them gets smaller as zgets larger. The answer is E.

6. x^2 + y^2 = z is the equation for a circle of radius sqrt(z).They are unevenly spaced once again, because the radii do notincrease linearly with z. The answer is F.

7. Solving for y gives: y = (-2/3)x + z/3. This is the equation fora line of slope -2/3 with y-intercept z/3. These are parallelbecause they all have the same slope, and evenly-spaced becauseeach time we increase z by 1 the y-intercept moves up by 1/3. Theanswer is D.

6 0
3 years ago
17/10 - 2/5 = *<br> Helpppp
uysha [10]
17/10-(2/5x2/2)
17/10-4/10
=13/10
8 0
2 years ago
You are to take a multiple-choice exam consisting of 100 questions with 5 possible responses to each question. Suppose that you
xeze [42]

Answer:

20

Step-by-step explanation:

This is a binomial distribution

n = 100; p = 1/5

E(x) = np = (100)(1/5) = 20

6 0
3 years ago
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