Solve the problem.EJ can overhaul a boat's diesel inboard engine in 15 hours. His apprentice takes 30 hours to do the same job. How long would it take them working together assuming no gain or loss in efficiency?
A. 45 hr
B. 10 hr
C. 4 hr
D. 6 hr
Answer: B
Mathematics
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Solve the problem.Sue can sew a precut dress in 3 hours. Helen can sew the same dress in 2 hours. If they work together, how long will it take them to complete sewing that dress? Give your answer rounded to one decimal place, if necessary.
A. 1.8 hr B. 5 hr C. 2.5 hr D. 1.2 hr
Mathematics
Solve the equation.
- 
= 3
A. {-2} B. {2} C. {2, 38} D. {3, 8}
Mathematics
Simplify.
A. 
B. 
C. 
D. 
Mathematics
Find an algebraic expression equivalent to the given expression.sin (arcsec u)
A. 
B. 
C. 
D. 
Mathematics