## Thinking Mathematically (6th Edition)

$39$ square feet.
The area of a rectangle can be calculated as: $T=a\times b$ The area of this figure can be calculated as: Area of the big rectangle (with sides of $2+5$ and $9+3$) minus the area of the small rectangle (with sides of 5 and 9): $T=(2+5)\times(9+3)-(5\times9)=7\times12-45=84-45=39$ square feet.