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. 25 watches
B. 36 watches
C. 40 watches
D. 50 watches
Answer: B
Mathematics
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Solve the problem.Find the mass of a solid right circular cylinder of radius 5 and height 4 if its density at any point is proportional to the square of the distance from that point to the lateral edge of the cylinder.
A. 
?k
B. 
?k
C. 1250?k
D. 
?k
Mathematics
Complete.1.28 metric tons = ____ Kg
A. 128 B. 1280 C. 12.88 D. 12800
Mathematics
Perform the indicated operation by hand.0.9 ÷ 0.06
A. 16 B. 15 C. 1.5 D. 4
Mathematics
Solve the problem.If tan ? = x + 1 and tan ? = x - 1, show that cot(? + ?) = 
What will be an ideal response?
Mathematics