GMAS review (Identifying and evaluating functions)

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Three relations are shown in the image. Which of these relations is a function?

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A only

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4

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14

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9

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Formulate a function to determine the profit from selling x tickets if a theatre group charges $12.50 per ticket and production costs are $150.

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Verizon charges $35 a month as a flat fee plus $0.28 for every phone call made. Formulate a function that models a phone bill as a function of phone usage.

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Non-Linear