Solve the problem.BJ can overhaul a boat's diesel inboard engine in 30 hours. His apprentice takes 60 hours to do the same job. How long would it take them working together assuming no gain or loss in efficiency?
A. 20 hr
B. 12 hr
C. 90 hr
D. 8 hr
Answer: A
Mathematics
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Convert the mixed number to an improper fraction.-5
A. - 
B. - 
C. - 
D. - 
Mathematics
Provide an appropriate response.Change 
to a percent equivalent.
A. 62.5% B. 78% C. 1.6% D. 0.625%
Mathematics
Estimate and find the actual sum expressed as a mixed number in simplest form.6
+ 7
A. Estimate: 13; Actual: 14
B. Estimate: 14; Actual: 13
C. Estimate: 13; Actual: 13
D. Estimate: 14; Actual: 14
Mathematics
Multiply.-4 ? 18
A. -90 B. -72 C. 68 D. -68
Mathematics