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 should he repair to produce the lowest cost?
A. 168 watches
B. 196 watches
C. 49 watches
D. 42 watches
Answer: D
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Solve the problem.Use the formula N = Iekt, where N is the number of items in terms of the initial population I, at time t, and k is the growth constant equal to the percent of growth per unit of time. There are currently 74 million cars in a certain country, decreasing by 3.8% annually. How many years will it take for this country to have 60 million cars? Round to the nearest year.
A. 14 years B. 4 years C. 6 years D. 69 years
Determine if the infinite geometric series converges or diverges. If the series converges, find its sum.5 - 
+ 
- 
+ . . .
A. converges, 
B. diverges
C. converges, - 
D. converges, 
Solve for the variable.-8x = -128
A. 2 B. 16 C. 120 D. -120
Solve the problem.The polynomial 
gives the predicted sales volume of a company, in millions of items, where x is the number of years from now. Determine the predicted sales 7 years from now. Round your answer to two decimals, if necessary.
A. 17.92 million B. 35.36 million C. 14.74 million D. 19.55 million