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Mathematics 9 Online
OpenStudy (anonymous):

On Fridays at the ballpark, a cup of soda is $3; each refill is $0.50. If x represents the number of refills, which of the following functions represents the amount a person spends on soda? A f(x) = 0.5x + 3 B f(x) = 3x + 0.5 C f(x) = 3x + 3.5 D f(x) = 0.5x + 3.5

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