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 the cost in dollars, and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 39 watches
B. 61 watches
C. 40 watches
D. 30 watches
Answer: A
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A. r(r + 1)(r + 9) B. r(r + 9)2 C. (r + 9)2 D. r(r + 9)
Graph the inequality.y ? -x2 - 2x - 2 
A. 
B. 
C. 
D. 
Solve the problem.Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $105.00 for 3 days and 300 miles, while Mary was charged $190.00 for 5 days and 600 miles. What does Best Rentals charge per day and per mile?
A. $19 per day; 16 ¢ per mile B. $15 per day; 20¢ per mile C. $21 per day; 16¢ per mile D. $20 per day; 15¢ per mile
Find all cube roots of the complex number. Leave answers in trigonometric form.-125
A. 5 cis 180°, 5 cis 0° B. 5 cis 60°, 5 cis 180°, 5 cis 300° C. 5 cis 120°, 5 cis 180°, 5 cis 300° D. 5 cis 30°, 5 cis 150°, 5 cis 270°