Time remaining:
Define a variable for the unknown.

Algebra
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Vicky has a cell-phone plan that charges $45 per month and $0.15 for every minute that she uses the phone beyond what her plan allows. Last month, she was billed $54.60.

Define a variable for the unknown.

Mar 19th, 2015

x could be the variable which represent no. of minutes she uses phone beyond her plan.

Mar 19th, 2015

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