Answer:
Amanda needs to complete [tex]\( \frac{35}{2} \)[/tex] or 17.5 chores to exactly meet $90 based on the equation. However, since she cannot complete half a chore and she needs to raise more than $90, she will need to complete at least 18 chores.
Step-by-step explanation:
To find out how many chores Amanda needs to complete to raise more than $90 for her fundraiser, let's set up an equation based on the information given:
1. Her parents donated $20.
2. Her grandparents will give her $4 for each chore she completes.
We want the total amount raised to be more than $90. Let's use [tex]\( c \)[/tex] to represent the number of chores she needs to complete. The equation to calculate the total money raised [tex]\( T \)[/tex] can be expressed as:
20 + 4c > 90