Each matrix is nonsingular. Find the inverse of the matrix. Be sure to check your answer.
A. 
B. 
C. 
D. 
Answer: D
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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. 87 watches B. 20 watches C. 43 watches D. 50 watches
The graphs of two functions f(x) and g(x) are given.Solve f(x) ? g(x).
A. x ? -3 or x ? 3 B. x ? -2 or x ? 2 C. -3 ? x ? 3 D. -2 ? x ? 2
Solve by graphing.The cost y (in hundreds of dollars) of tuition at one community college is given by the linear equation 
where x is the number of credits for which a student registers. Graph the equation and use the graph to estimate the cost of tuition if a student registers for 15 credits. 
A. $2900 B. $2100 C. $3300 D. $2175
Use your estimation skills to pick the most reasonable answer. Do not solve the problem.133.55 + 84.0027
A. 2175.527 B. 21.75527 C. 217.5527