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: B
Mathematics
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Find the LCM of the set of numbers.30, 121
A. 4356 B. 726 C. 3630 D. 18,150
Mathematics
Convert to scientific notation.3,400,000
A. 3.4 × 106 B. 3.4 × 10-5 C. 3.4 × 105 D. 3.4 × 10-6
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Simplify the expression. Assume that all variables represent non-negative real numbers.9x
- 12y
+ 6x
A. 3x2
B. 3xy
C. 
(15x - 12y)
D. y
(15x2y - 12)
Mathematics
Match the equation to the graph.(y - 1)2 = 8(x - 1)
A. 
B. 
C. 
D. 
Mathematics