Question

A pre-paid cell phone company charges $17.45 as a monthly access fee and $0.15 per minute of calling time..

Express the monthly cost C as a function of x, the number of minutes used.
What will the monthly cost be if you make 405 minutes of calls this month? $

Answer 1

$17.45 + $0.15x = C
$17.45 + 0.15(405 min) = $78.20