Let t be the number of trees planted.
The amount earned by planting t trees is given by:
110 + 5t
To make at least $275 on a given day, the inequality would be:
110 + 5t ≥ 275
Simplifying and solving for t, we have:
5t ≥ 165
t ≥ 33
Therefore, the tree planter needs to plant at least 33 trees to earn at least $275 on a given day.