Question

Carolina goes to a paintball field that charges an entrance fee of \$18$18 and \$0.08$0.08 per ball. The field has a promotion that says, "Get \$10$10 off if you spend \$75$75 or more!" Carolina wonders how many paintballs she needs to buy along with the entrance fee to get the promotion.Let BB represent the number of paintballs that Carolina buys.