To model the scenario where Mrs. Pete wants to repaint her classroom walls with a total budget of $350, we know that the cost per square foot is $3.50. If we let \( A \) represent the area in square feet that can be painted, then the total cost of painting the walls can be expressed as \( 3.5A \).
Since Mrs. Pete has a maximum budget of $350, the appropriate inequality would be:
\[ 3.5A \leq 350 \]
This represents that the total cost \( 3.5A \) must be less than or equal to her budget of $350.
Therefore, the correct model that can be used to find the largest area that can be repainted is:
3.5A ≤ 350