Tristan goes to a restaurant and the subtotal on the bill was xx dollars. A tax of 7% is applied to the bill. Tristan decides to leave a tip of 16% on the entire bill (including the tax). Write an expression in terms of xx that represents the total amount that Tristan paid.

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answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

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