Question

Tina pet sits to earn extra money. She charges a flat service fee of $20, plus $20 per day. If one of her customers spent less than $160, which of the following inequalities could be used to solve for x, the number of days the customer paid for pet sitting?
$20x + $20 < $160
$20x < $180
$20x - $20 < $160
$20x < $160

Answer 1

The first one is correct as the service fee plus the daily cost must be added to find the total cost which is less then $160.