Multiply. Assume that all variables represent nonnegative real numbers.
(
- 
)
A. 3
- 3
B. 6
C. 12
D. 9 - 
Answer: B
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Provide an appropriate response.The standard normal probability density function is defined by f(x) = 
e- x2/2. (a) Use the fact that 
dx = 1 to show that 
dx =
.(b) Use the result in part (a) to show that the standard normal probability density function has variance 1.
What will be an ideal response?
Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y is directly proportional to x. When x = 20, then y = 24.
A. k = 4; y = 4x
B. k = 4; y = x + 4
C. k = 
; y = 
x
D. k = 
; y = 
x
Solve the problem.After a person stops pedaling a bicycle, the wheel rotates 500 times the first minute. Each subsequent minute, it rotates 
as many times as in the previous minute. How many times will the wheel rotate before coming to a complete stop?
A. 3500 rotations B. 2000 rotations C. 666.7 rotations D. 4000 rotations
Evaluate -a.a = 15
A. 0 B. -15 C. -1 D. 15