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Mathematics, 03.09.2021 01:00 sonaihriley

Can someone help me make this into a formula? I know who to find the answer but I don't know what the formula is for this. Represent the relationship between the cost, c , of a call and the time, t , for the cell phone plan shown below.

time in hours : 0 1 2 3
cost in dollars : 10 13 16 19

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