Solve by using the quadratic formula.x2 + 18x + 71 = 0
A. 9 ± 
B. -18 + 
C. -9 ± 
D. 9 + 
Answer: C
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Rationalize the denominator.
A. 
- 
B. 
C. 
D. 
Solve.A rock falls from a tower that is 78.4 m high. As it is falling, its height is given by the formula 
How many seconds will it take for the rock to hit the ground (h=0)? Round to the nearest tenth.
A. 8.9 sec B. 1300 sec C. 4 sec D. 16 sec
Add or subtract as indicated. Write the answer in simplest form.
+ 
A. 5z + 2
B. 
C. 
D. 
Solve the problem.The total profit function P(x) for a company producing x thousand units is given by 
Find the values of x for which the company makes a profit. [Hint: The company makes a profit when 
A. x is less than 11 thousand units B. x is between 3 thousand units and 11 thousand units C. x is greater than 3 thousand units D. x is less than 3 thousand units or greater than 11 thousand units