Answer :
We are asked to determine the square feet of paint required to paint three walls 8 feet high and 11 feet long. To do that we will determine the area of the walls.
Since each wall has the same dimensions we will determine the area of one wall and multiply the result by 3. The area of a rectangle is given by:
[tex]A=lh[/tex]Where:
[tex]\begin{gathered} l=\text{ length} \\ h=\text{ high} \end{gathered}[/tex]Since there are 3 walls we will multiply the area by 3
[tex]A=3lh[/tex]Now, we substitute the values:
[tex]A=3\left(8ft\right)\left(11ft\right)[/tex]Solving the operations:
[tex]A=264ft^2[/tex]Therefore, the area is 264 square feet.