Simplify the expression. Assume that variables represent nonzero numbers.
3
A. 
B. 
C. 
D. 
Answer: C
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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. 
= 
D. 
= 
Solve the problem.If an object is projected upward with an initial velocity of 112 ft per sec from a height h of 128 ft, then its height t sec after it is projected is defined by the equation 
. How many sec after it is projected will it hit the ground?
A. 1 sec B. 9 sec C. 8 sec D. 10 sec
Find the numerical value of the expression for 
and 
A. a) - 
b) 
B. a) 
b) 
C. a) 
b) - 
D. a) - 
b) 
Find the square root if it is a real number. If it is not a real number, state so.
A. not a real number B. -264 C. 23 D. -23