Question

Carolina goes to a paintball field that charges an entrance fee of $18 and $ 0.08 per ball. the field has a promotion that says, "Get $10 off if you spend $75 or more!" Carolina wonders how many paintballs she needs to buy along with the entrance fee to get the promotion. A. 18 + 0.08B ≤ 75 B. 18 + 0.08B ≥ 75 C. 18 + 0.08B ≤ 10 D. 18 + 0.08B ≥10

Answer 1

The correct equation to use for this problem is B 18 + .08B > 75 where B stands for Balls.
To solve this equation, solve for B to get the minimum number of paintballs Carolina would need to buy to get the promotion.
Subtract 18 from both sides.
.08B > 57
Now divide both sides by .08 to isolate the variable.
B > 712.5
Because you cannot buy half a paintball, round up.
B > 713
Carolina would have to buy at least 713 paintballs to get the promotion!