Answer the question.What value for x makes the expression 21 - x equal to 14?
A. 7
B. 17
C. 8
D. 35
Answer: A
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Solve the problem.Find the centroid of the region enclosed between the cone with equation 
and the plane with equation 
A. (
, 
, 
) = 
B. (
, 
, 
) = 
C. (
, 
, 
) = 
D. (
, 
, 
) = 
Find the requested value of the second derivative of the function.f(x) = 9e-x2; Find f"(2) .
A. 135e-8 B. 162e-8 C. 126e-4 D. 144e4
Solve the problem.The distance d in miles that can be seen on the surface of the ocean is given by 
where h is the height in feet above the surface. How high (to the nearest foot) would a platform have to be to see a distance of 14.5 miles?
A. 112 ft B. 273 ft C. 124 ft D. 210 ft
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 760. Find a linear equation which fits this data.
A. y = 3.5x + 515 B. y = 3.15x - 519 C. y = 3.15x + 519 D. y = -3.5x + 515