Solve the problem.BJ 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. 10 hr
B. 45 hr
C. 4 hr
D. 6 hr
Answer: A
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (9t - 3t3)i + 3tan(3t)j + e5tk
A. a
= 
?i + 108j + 25e5/12?k
B. a
= - 
?i - 108j + 25k
C. a
= - 
?i + 108j + 25e5/12?k
D. a
= - 
?i - 108j + 25e5/12?k
Mathematics
Find the perimeter. 
A. 214 ft B. 216 ft C. 219 ft D. 222 ft
Mathematics
Solve the equation.
= 5
A. 
B. 
C. 
D. 
Mathematics
Subtract.
A. 10.427 B. 11.000 C. 10.413 D. 10.423
Mathematics