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 = 24, y = 60
B. x = 40, y = 40
C. x = 20, y = 24
D. x = 20, y = 20
Answer: D
Mathematics
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Insert <, >, or = to make the statement true.6 
-1
A. < B. > C. =
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Find the product. Write the answer in standard form.(-2 + 3i)3
A. 46 + 36i + i3 B. 46 + 107i C. i3 - 54i2 + 36i + a3 D. 46 + 9i
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Solve the equation. Express irrational answers in exact form and as a decimal rounded to 3 decimal places.ln x + ln (x + 7) = 1
A. 
? 0.369
B. -7 + 
? 0.738
C. 
? 3.692
D. 
? -7.369
Mathematics
Solve the problem.For what numbers x, 0 ? x ? 2?, does cos x = -1?
A. ?
B. 
C. 
, 
D. none
Mathematics