Solve the problem. Round your answer, if appropriate.Boyle's law states that if the temperature of a gas remains constant, then PV = c, where 
, 
, and c is a constant. Given a quantity of gas at constant temperature, if V is decreasing at a rate of 15 in. 3/sec, at what rate is P increasing when P = 70 lb/in.2 and V = 50 in.3? (Do not round your answer.)
A. 
lb/in.2 per sec
B. 21 lb/in.2 per sec
C. 
lb/in.2 per sec
D. 
lb/in.2 per sec
Answer: B
Mathematics
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Find the mass of the wire that lies along the curve r and has density ?.r(t) = (10 cos t)i + (10 sin t)j + 10tk, 0 ? t ? 2?; ? = 9
A. 20?
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B. 180?
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