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. 80 hr
B. 15 hr
C. 6 hr
D. 12 hr
Answer: B
Mathematics
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Perform the indicated operation by hand.14.6 + 14.8
A. -0.2 B. 29.5 C. 0.2 D. 29.4
Mathematics
Solve the equation.x2 = -18
A. ±3i
B. ±9
C. ±9i
D. ±3
Mathematics
Calculate.81 ÷ 9 ? 9 ÷ 3 ? 2187
A. 
B. 
C. 59,049
D. 729
Mathematics
Solve the problem.A thermometer reading 9°C is brought into a room with a constant temperature of 25°C. If the thermometer reads 18°C after 4 minutes, what will it read after being in the room for 10 minutes? Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt.(Round your answer to two decimal places.)
A. 27.03°C B. 22.97°C C. -3.78°C D. 25°C
Mathematics