Solve the problem.BJ can overhaul a boat's diesel inboard engine in 20 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. 12 hr
B. 15 hr
C. 80 hr
D. 6 hr
Answer: B
Mathematics
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Find y '.y = 
A. - 
+ 2x
B. - 
- 2x
C. 
+ 2x
D. - 
- 2x
Mathematics
Solve the problem.An organization determines that the cost per person of chartering a bus is given by the formula 
where x is the number of people in the group and C(x) is in dollars. Find a formula for the inverse of this function.
A. C-1(x) = 
B. C-1(x) = 
C. C-1(x) = 
D. C-1(x) = 
Mathematics
Match the correct function to the graph.
A. y = 
B. y = x - 1
C. y = 
D. y = 
Mathematics
Find the exact value of the expression. Do not use a calculator.cos 60° + tan 60°
A. 
B. 2
C. 
D. 
Mathematics