Solve the problem.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 21,000 mi?
A. 
in.
B. 2,112,000 in.
C. 
in.
D. 
in.
Answer: C
Mathematics
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Solve the problem.John owns a hot dog stand. His profit, in dollars, is given by the equation 
where x is the number of hot dogs sold. What is the most he can earn?
A. $108 B. $150 C. $87 D. $49
Mathematics
Use the horizontal line test to determine if the function is one-to-one.
A. No B. Yes
Mathematics
Write as a percent.
A. 7% B. 700% C. 70% D. 0.7%
Mathematics
Solve the equation.x - 3 = 4
A. 7 B. 1 C. -1 D. -7
Mathematics