Solve the problem.Suppose that the labor cost for a building is approximated by 
where x is the number of days of skilled labor and y is the number of days of semiskilled labor required. Find the x and y that minimize cost C.
A. x = 15, y = 6
B. x = 6, y = 45
C. x = 18, y = 15
D. x = 36, y = 30
Answer: C
Mathematics
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Find all vertical asymptotes of the given function.f(x) = 
A. x = -7, x = 7, x = -9 B. x = 49, x = -9 C. x = -7, x = 7 D. x = 0, x = 49
Mathematics
Solve the problem.How many 5-card poker hands consisting of 2 aces and 3 kings are possible with an ordinary 52-card deck?
A. 6 B. 12 C. 288 D. 24
Mathematics
Evaluate -x for the given value of x.x = 2
A. -2 B. 0 C. -3 D. 2
Mathematics
Use the horizontal line test to determine whether the function is one-to-one.
A. Yes B. No
Mathematics