Evaluate the integral.
A. tanh (9x - 5) + C
B. 3 sech3 (9x - 5) + C
C. 
coth (9x - 5) + C
D. 
tanh (9x - 5) + C
Answer: D
Mathematics
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Solve the problem.A heat engine is a device that converts thermal energy into other forms. The thermal efficiency, e, of a heat engine is defined by 
where Qh is the heat absorbed in one cycle and Qc, the heat released into a reservoir in one cycle, is a constant. Find 
.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
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Find the zeros of the function.f(x) = 4x2 + 40x + 100
A. -5, 5 B. 0, -5 C. 5 D. -5
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Find fraction notation for the percent notation in the problem.Housing sales for the month of May were up 17% from April.
A. 
B. 
C. 
D. 
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If possible, evaluate the expression by hand. If not, approximate the answer to the nearest hundredth.641/3
A. 256 B. 12 C. 768 D. 4
Mathematics