Use two equations in two variables to find the following integers:One integer is twice another. Their sum is 39.
A. 13, 26
B. 26, 52
C. 13, 52
D. 16, 23
E. no such integers exist
Answer: A
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A. x = 1 B. x = -1 C. x = ±1 D. None
Solve the problem.Under certain conditions, the cost per mile C of operating a car is a function of the speed v (in mi/h) of the car, given by C = av2 + bv + c. If C = 25.25 ¢/mi for v = 5 mi/h, C = 26 ¢/mi for v = 20 mi/h, and 
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