Long distance calls cost x cent how much 5-minute call cost, Mathematics

A long distance calls costs x cents for the first minute and y cents for every additional minute. How much would a 5-minute call cost?

The cost of the call is x cents plus y times the additional minutes. Because the call is 5 minutes long, she will pay x cents for 1 minute and y cents for the other four. Thus the expression is 1x + 4y, or x + 4y, since it is not essential to write a 1 in front of a variable.

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