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. 
= 
Answer: D
Mathematics
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Use substitution to determine whether the given number is a zero of the given polynomial.2; f(x) = x4 - 7x2 + 12
A. Yes B. No
Mathematics
Find the difference.-12 - (-1)
A. 11 B. -13 C. 13 D. -11
Mathematics
For the given functions f and g, find the requested composite function.f(x) = -6x + 9, g(x) = 2x + 3;
Find (g ? f)(x).
A. -12x - 15 B. -12x + 21 C. -12x + 27 D. 12x + 21
Mathematics
Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.y = 6
, y = 6
A. 24? B. 2? C. 1728? D. 48?
Mathematics