Find the indicated derivative.Find y " if y = 2 sin x.
A. y " = 2 sin x
B. y " = - 2 sin x
C. y " = 2 cos x
D. y " = 4 sin x
Answer: B
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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 B. 48 C. 73 D. 98
For the given functions f and g, find the requested composite function value.f(x) = 2x + 9, g(x) = 
;
Find (g ? f)(3).
A. 5
B. 
C. 
D. 
Factor completely. If the polynomial cannot be factored, say it is prime.x4 - 64
A. prime B. (x2 - 8)2 C. (x2 + 8)2 D. (x2 + 8)(x2 - 8)
Suppose that a gas satisfies the universal gas law, 
with n equal to 40 moles of the gas and R, the universal gas constant, equal to 0.082054. What is V if 
(kelvins, the units in which temperature is measured on the Kelvin
scale) and 
atmosphere? Round your answer to four decimal places.
?
A. 
B. 
C. 
D. 
E. 