HELP i rlly need it

Question

A cell phone company has a basic monthly plan of $40 plus $0.45 per minute. Before receiving his statement, Ethan saw he was charged a total of $48.10. Write an equation to determine how many minutes he used during the month.

Answer 1

When you're writing an equation with a fixed amount and a per unit amount, you multiply the per unit amount times the units (in this case, minutes).

So the equation is 40 + .45m = 48.10.

To determine the number of minutes: Subtract 40 from both sides of the equation: .45m = 8.10

Divide both sides by .45: m = 18 minutes