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. 
= Qh - Qc
D. 
= 
Answer: D
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. 3-2? 34
A. 
B. 6
C. -729
D. 9
Simplify by using the order of operations. Round your answer to the nearest hundredth.(-9.4)2 + 1.9 - 8.4
A. 81.86 B. 2.9 C. 8.41 D. 12.3
Solve the problem.Two vertical poles of lengths 20 feet and 32 feet are situated on level ground 50 feet apart, as shown in the figure below. A piece of wire is to be strung from the top of the 20-ft pole, to a stake in the ground, to the top of the 32-ft pole. At what distance from the 20-foot pole should the stake be located to minimize the amount of wire used? Round your answer to the nearest tenth of a foot.20 ft
32 ft? 50 ft
A. 15.5 ft B. 19.5 ft C. 17.2 ft D. 23.3 ft
Graph the parabola.f(x) = -x2 + 2x - 1
A. 
B. 
C. 
D. 