Find the standard deviation of the probability density function to the nearest hundredth.f(x) = 2(1 - x); [0, 1]
A. 0.25
B. 0.33
C. 0.31
D. 0.24
Answer: D
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Multiply.(-8y)(-7y9)
A. -15y9 B. 56y10 C. -56y10 D. 8y - 7y9
Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at x = -6 and x = 6. The cross sections perpendicular to the x-axis between these planes are squares whose diagonals run from the semicircle y = - 
to the semicircle y = 
.
A. 
B. 
C. 
D. 
Determine the period and range for the function.y = 2 cos(x + ?/6)
A. period: ?; range: [-2, 2]
B. period: 2?; range: 
C. period: ?; range: [0, 2]
D. period: 2?; range: [-2, 2]
Solve the problem.When going more than 38 miles per hour, the gas mileage of a certain car fits the model 
where x is the speed of the car in miles per hour and y is the miles per gallon of gasoline. Based on this model, at what speed will the car average 15 miles per gallon? (Round to nearest whole number.)
A. 149 mph B. 73 mph C. 48 mph D. 98 mph