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 should he repair to produce the lowest cost?
A. 244 watches
B. 42 watches
C. 168 watches
D. 61 watches
Answer: B
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Tell whether the relation is reflexive, symmetric, or transitive on the set of all people. Also tell whether the relation is an equivalence relation."Lives next door to"
A. Symmetric; not an equivalence relation B. Transitive; not an equivalence relation C. Symmetric and transitive; equivalence relation D. Reflexive and symmetric; not an equivalence relation
Solve.A regular pentagon has a side length of 2.4 mi. Find its perimeter.
A. 14.4 mi B. 12 mi C. 9.6 mi D. not enough information given
Forces F1 and F2 act at the same point. Find the resultant force F and its magnitude.F1 = 2i - 2j, F2 = 6i - 13j
A. F = 4i - 19j ; 
= 19.4164878
B. F = 8i - 15j ; 
= 17
C. F = 8i + 15j ; 
= 17
D. F = 4i + 19j ; 
= 19.4164878
Add or subtract as indicated. Simplify, if necessary.
- 
A. 0 B. 1 C. m D. -m