A cell phone company charges a flat rate of $2.50 per month with an additional charge of $.15 per minute. How many minutes to Laura talk on her cell phone if her monthly bill is $72.25.
Let's start by setting up an equation based on the given information:
$2.50 (flat rate) + $0.15 (charge per minute) x (number of minutes) = $72.25 (total monthly bill)
So, the equation becomes:
$2.50 + $0.15x = $72.25
Subtracting $2.50 from both sides:
$0.15x = $69.75
Dividing both sides by $0.15:
x = 465
Therefore, Laura talked for 465 minutes on her cell phone.