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: A
Mathematics
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Simplify.-8x7y3z0
A. 1 B. -8x7y3 C. 8x7y3 D. 0
Mathematics
Use the distributive property to multiply. Then, if possible, simplify the resulting expression.3(7 + m)
A. 21m B. 21 + m C. 21 + 7m D. 21 + 3m
Mathematics
Solve the problem.A sample of matter has a temperature distribution given by 
Describe the level surfaces and write an equation for the surface T = 300.
What will be an ideal response?
Mathematics
Write the equation in the standard form ax2 + bx + c = 0. Then identify the values of a, b, and c. Do not actually solve the equation.9x2 + 10x - 7 = 0
A. a = 9, b = 10, c = 7 B. a = 9, b = -10, c = -7 C. a = 9, b = 10, c = -7 D. a = 9, b = -10, c = 7
Mathematics