A cell phone company charged a flat rate of $2.50 per month within an additional charge of $.15 per minute. How many minutes did Laura talk on her cell phone if her monthly bill was $72.25
Let x be the number of minutes Laura talked on her cell phone.
The total monthly bill can be represented as:
$2.50 + $0.15x = $72.25.
Subtract $2.50 from both sides:
$0.15x = $69.75.
Divide both sides by $0.15:
x = 465.
Laura talked on her cell phone for 465 minutes.