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. 46 watches
B. 79 watches
C. 20 watches
D. 39 watches
Answer: A
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Express the sum in sigma notation.- 
+ 
- 
+ 
- 
A. 
B. 
C. 
D. 
Solve the problem.In one study the maximum heart rates of conditioned athletes were examined. A group of athletes was exercised to exhaustion. Let x represent an athlete's heart rate five seconds after stopping exercise and y represent an athlete's heart rate ten seconds after stopping exercise. It was found that the maximum heart rate H for these athletes satisfied the following two equations. H = 0.491 x + 0.468 y + 11.2 H = -0.981 x + 1.872y + 26.4If an athlete had a maximum heart rate of H = 151, determine the value of x graphically to the tenths place.
A. x = 148.2 B. x = 147.6 C. x = 147.1 D. x = 147.9
Solve the problem.For what numbers x, 0 ? x ? 2?, does cos x = 0?
A. 0, 1, 2
B. 0, ?, 2?
C. 0, 1
D. 
, 
Find the product and simplify.
? 
A. 
B. 
C. 
D. 