Solve.The sum of the ages of Art, Ben, and Cal is 59. Art is 1 year older than Cal and Cal is 1 year younger than Ben. Which of these people were teenagers 7 years ago?
A. Art
B. Art, Ben, and Cal
C. Ben
D. Art and Ben
Answer: D
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Calculate the arc length of the indicated portion of the curve r(t).Following the curve r(t) = 12ti + (5 cos t)j + (5 sin t)k in the direction of increasing of arc length, find the point that lies 65? units away from the point where 
A. (60?, -5, 0) B. (60?, 0, -5) C. (60, -5, 0) D. (60?, 0, 0)
Use the given triangles to evaluate the expression. Rationalize all denominators. 
cot 60° - cos 45°
A. 
B. 
C. 
D. 
Solve the problem.A coin is tossed upward from a balcony 292 ft high (ho) with an initial velocity (vo) of 
, according to the formula h(t) = -16t2 + vot + ho, where t is time in seconds. During what interval of time will the coin be at a height of at least 100 ft?
A. 0 sec ? t ? 1 sec B. 4 sec ? t ? 8 sec C. 0 sec ? t ? 4 sec D. 3 sec ? t ? 4 sec
Suppose that the production function for a product is 
, where x represents the number of work hours per month and y is the number of available machines. Determine the marginal productivity of y.
A. 
B. 
C. 
D. 
E. 