The inequality that can be used to find the maximum number of fill-ups she can purchase during the rest of the month, assuming each fill-up costs $30 is 3 fill-ups
150 ≤ 60 + 30x
150 - 60 ≤ 30x
90 ≤ 30x
divide both sides by 30
90 / 30 ≤ x
3 ≤ x
x ≥ 3
Therefore, the inequality that can be used to find the maximum number of fill-ups she can purchase during the rest of the month, assuming each fill-up costs $30 is 3 fill-ups
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