Lous car had 6.5 gallons in the 16 gallon tank on the coldest day of the year. Lou filled her tank with gas that cost 3.90 per gallon. How much did Lou spend on gas?

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step-by-step explanation:

the x's and the y's both go up the same amount each time, therefore it will be a linear function because it will go in a straight line when drawn on a graph.

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a negative exponent is translated as follows:

so, we have