Answer:
Maya should purchase 33 bags of soil.
Explanation:
Let 'x' be the number of bags of soil.
Given is that each bag contains 1.5 cubic feet of soil. And Maya already has 4.5 cubic feet of soil. So, we can relate this as:

As, Maya needs 54 cubic feet of soil in total; so we will put




Therefore, Maya needs 33 bags of soil.