Math Algebra 8.2.4.1

26. A local mall is having a promotion where t-shirts are $4.00 each. If it costs Mary 8 dollars in gas to drive to and from the mall, which of the following equations models the total cost of buying x shirts?

A. f(x) = 8 + 4x

B. f(x) = 4 + 8x

C. f(x) = 8x + 4x

D. f(x) = 12x

27. The speed of an accelerating car is modeled by the equation f(t) = 32 + 4t where t is the time, in seconds, the car is driving. At what point will the car’s speed reach 52 mph?

A. t = 5

B. t = 10

C. t = 13

D. t = 15

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