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. 32 watches
B. 65 watches
C. 45 watches
D. 40 watches
Answer: C
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Solve.The voltage in an electrical circuit measures -280 volts. If the resistance is 40 ohms, find the current.
A. 47 A B. -280 A C. -7 A D. 280 A
Solve.Assume that in 1985, the annual consumption of pork was about 55 lb per person and that in 1997, it was about 36 lb per person. In addition, assume that consumption is decreasing according to the exponential decay model. Find the value k, and write an exponential function that describes pork consumption after time t, in years. (Round decimals to three places.)
A. k = 0.299; C(t) = 55e0.299t, where t is the number of years since 1985. B. k = 0.035; C(t) = e-0.035t, where t is the number of years since 1985. C. k = -0.035; C(t) = 55e-0.035t, where t is the number of years since 1997. D. k = 0.035; C(t) = 55e-0.035t, where t is the number of years since 1985.
Simplify the complex number to its rectangular form.
+ 
A. 7 + 8j B. 15j C. 8 + 7j D. 7 - 8j
Determine whether the graphed relation is a function.
A. function B. not a function