Factor the polynomial completely.x2 - 4xy - 21y2
A. (x - 3y)(x + 7y)
B. (x - 3y)(x + y)
C. prime polynomial
D. (x + 3y)(x - 7y)
Answer: D
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Solve.The amount of tread left on a tire varies inversely as the number of miles the tire has traveled. A tire that has traveled 66,000 mi has 
in of tread left. How much tread will be left on a tire that has traveled 57,000 mi? Express your answer as a simplified fraction.
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Answer the question.If n is an odd number, then which of the following statements is true?
A. The equation xn + 1 = 0 has exactly one real root. B. The equation xn + 1 = 0 has n + 1 roots. C. The equation xn + 1 = 0 has an odd number of nonreal roots. D. The equation xn + 1 = 0 has an even number of real roots.
Find a so that the statement is true.
A. 0 B. 4 C. 7 D. 5 E. 6
Solve the problem.A restaurant has a capacity of 39 patrons. If the restaurant is 
full, how many patrons are at the restaurant?
A. 13 patrons B. 24 patrons C. 28 patrons D. 26 patrons