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