Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by 
, 
, where x is the number of machines used. Over what interval in the domain do average costs decrease?
?
A. ?
B. 
C. 
D. 
E. 
Answer: C
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A delivery truck must deliver packages to 5 different store locations (A, B, C, D, and E). The trip must start and end at D. The graph below shows the distances (in miles) between locations. We want to minimize the total distance traveled.
The nearest-neighbor tour starting with vertex D is given by:
A. D, B, E, C, A, D. B. D, E, A, B, C, D. C. D, C, A, B, E, D. D. D, A, B, E, C, D. E. none of these
Rotate the axes so that the new equation contains no xy-term. Graph the new equation.5x2 - 6xy + 5y2 - 8 = 0
A. 
B. 
Graph the parametric equation for the given interval. Add arrows to show how the curve is traced out. x = 
t2, y = 2t; -3 ? t ? 3
A. 
B. 
C. 
D. 
Solve the problem.The long jump record, in feet, at a particular school can be modeled by 
where x is the number of years since records began to be kept at the school. What is the record for the long jump 
after record started being kept? Round your answer to the nearest tenth.
A. 25.3 ft B. 25.5 ft C. 25.0 ft D. 22.4 ft