Desiree wants to move into a new apartment. Suppose her monthly income is $4,500. To be able to rent, Desiree’s monthly income must be at least three times as much as the monthly rent. What is the maximum rental fee Desiree can afford?

Desiree's monthly income must be at least three times the monthly rent.

Let the maximum rental fee Desiree can afford be x.
So, 3x ≤ $4,500
Dividing by 3 on both sides, we get:
x ≤ $4,500 / 3
x ≤ $1,500

Therefore, the maximum rental fee Desiree can afford is $1,500 per month.