Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where c is cost and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 20 watches
B. 36 watches
C. 73 watches
D. 39 watches
Answer: D
Mathematics
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Solve the problem.Suppose that the amount of oil pumped from a well decreases at the continuous rate of 
per year. When, to the nearest year, will the well's output fall to one-eighth of its present value?
A. 15 years B. 23 years C. 2 years D. 35 years
Mathematics
Find the perimeter of the polygon.Rectangle 
A. 2 yd B. 32 yd C. 17 yd D. 34 yd
Mathematics
Use the distributive property to multiply. Then, if possible, simplify the resulting expression.3(7 + m)
A. 21m B. 21 + m C. 21 + 7m D. 21 + 3m
Mathematics
Divide.
Round to the nearest thousandth.
A. 88.357 B. 88.367 C. 8835.723 D. 8.8357
Mathematics