Answer:
A. The student earned $18 for cleaning out his neighbor's garage.
Step-by-step explanation:
<em>Since it given that a student spend $18 for a haircut this week also means that she/he gave away $18 also known as -$18.</em>
<em>Thus, base on the given answer choices:</em>
<em>[A] is the only one that can make it positive.</em>
<em>Going through all answer choice:</em>
<em>A. The student earned $18 for cleaning out his neighbor's garage.</em>
<em>Earned = +</em>
<em>B. The student paid his little brother $18 for doing his chores.</em>
<em>Paid = -</em>
<em>C. The student purchased a gift for his mom for $18.</em>
<em>Purchased = -</em>
<em>D. The student gave $18 to a friend.</em>
<em>Gave = -</em>
<em>Hence, Answer is A. The student earned $18 for cleaning out his neighbor's garage.</em>
<u><em>~lenvy~</em></u>