Inequality

Question

Rachael buys at least 9 gallons of gas but no more than 15 gallons of gas each week. The price of gas has ranged from $2.35 to $2.55 per gallon each week.
Write an inequality to model all of the possible amounts of money Rachael spends on gas each week.

Answer 1

s represents what she spends

The least she can spend is the cheap gas times the least used, 9(2.35)

The most she would spend is the expensive gas times the most used, 12(2.55)

9(2.35) ≤ s ≤ 12(2.55)