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. 
= Qh - Qc
C. 
= - 
D. 
= 
Answer: A
Mathematics
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Solve the equation by the Square Root Method.x2 = 7
A. {
}
B. {7, -7}
C. no real solution
D. {
, -
}
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Determine whether the relation is a function.
A. A function B. Not a function
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Answer the question.Choose the expression that is equivalent to the following: (7x + 8y)(2y + 4x)
A. (7x + 8y)(4y + 2x) B. 11x + 10y C. (7x + 8y)(4x + 2y) D. (7x + 4y)(8x + 2y)
Mathematics
Find the vertices and graph the hyperbola.x2 - 4y2 = 64
A. (0, -8), (0, 8)
B. (-4, 0), (4, 0)
C. (-4, 0), (4, 0)
D. (-8, 0), (8, 0)
Mathematics