Express as a product.log7 
A. 
log (7 ? z)
B. 
log7 z
C. 
log 7 + 
log z
D. 
log 7 ? log z
Answer: B
Mathematics
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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. 
= 
Mathematics
Find the domain of the given function.f(x) = 
A. all real numbers x where x ? 
B. all real numbers x where x ? - 
C. all real numbers x where x > - 
D. all real numbers x where x > 
Mathematics
Simplify the algebraic expression.2.1(-4.3x - 2.6)
A. -9.03x - 5.46 B. 9.03x - 5.46 C. -9.03x - 2.6 D. 9.03x - 2.6
Mathematics
Evaluate.
, when x = 27 and y = 21
A. 34 B. 30 C. 48 D. 16
Mathematics