Question

Tina pet sits to earn extra money. She charges a flat service fee of $20, plus $15 per day. If one of her customers spent less than $140, which of the following inequalities could be used to solve for x, the number of days the customer paid for pet sitting?
$15x - $20 < $140
$15x < $160
$15x < $140
$15x + $20 < $140