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. 80 hr
C. 15 hr
D. 6 hr
Answer: C
Mathematics
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Solve the initial value problem.
= -18cos (3t), s '(0) = 11, s(0) = 8
A. s = 2 cos (3t) + 6 B. s = 2 cos (3t) + 11t + 6 C. s = -6 sin (3t) + 11 D. s = 6 cos (3t) + 11t + 2
Mathematics
Find the exact circumference of the circle in terms of ?.
A. 729.01? units B. 54.2? units C. 13.5? units D. 27.1? units
Mathematics
Graph the inequality.x - y > -4 
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.For a circle of radius 4 feet, find the arc length s subtended by a central angle of 30°. Round to the nearest hundredth.
A. 6.28 ft B. 376.99 ft C. 4.19 ft D. 2.09 ft
Mathematics