How do I find the area of a wall?

15 feet by 9 feet

Multiply.

A = LW

Is it 135

Actually it is 135 square feet.

To find the area of a wall, you need to multiply its length by its width.

In this case, you mentioned that the wall is 15 feet by 9 feet. So, to find the area, you would multiply 15 feet by 9 feet.

The formula to calculate the area is:
Area = Length × Width

By substituting the given measurements:
Area = 15 feet × 9 feet

Now, you can simply perform the multiplication to get the area of the wall:
Area = 135 square feet.

So, the area of the wall is 135 square feet.