Find the magnitude of the vector.
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?
?
A. ?
B. ?
C. ?
D. 
E. ?
Answer: D
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Find the cube root.
A. 
B. 
C. 
D. 
Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 40 watches B. 25 watches C. 36 watches D. 50 watches
Solve the problem.Suppose that the demand and price for a certain model of graphing calculator are related by 
where p is the price (in dollars) and q is the demand (in hundreds). Find the price if the demand is 100 calculators.
A. $86.75 B. $67.50 C. $102.50 D. $83.25
Solve the problem.A square playground has a white line drawn through its diagonal. This creates two triangles whose angle measures are 45°, 45°, and 90°. If the sides of the playground are 67 feet, find the length, x, of the diagonal. Round to one decimal place if needed. 
A. 116 ft B. 94.8 ft C. 47.4 ft D. 38.7 ft