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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Find the derivative of y with respect to the independent variable.y = 7x

A. x ln 7 B. 7x C. 7x ln 7 D. 7x ln x

Mathematics

Solve the inequality. Write the solution set in interval notation and graph it.-10r + 6 ? -2(4r - 11)

A. (-8, ?)

B. (-?, -8)

C. [-8, ?)

D. (-?, -8]

Mathematics

Write the expression with positive exponents, and simplify if possible.(-2)-4

A. 16
B. - 
C. -16
D.

Mathematics

Find the real solutions of the equation. = 9

A. {79} B. {81} C. {121} D. {83}

Mathematics