Two rectangular walls each with a length of and a width of need to be painted.

It costs per square foot for paint.

Find the area of the wall.

The area of the wall is .

      (Substitute and in the equation)

.

The area of the wall is .

Since there are two walls, the total area that needs covered is .

The total area is .

Find how much will it cost to paint the walls.

The total cost is product of cost per square foot and total area of the two walls.

It costs to paint the walls.

Option J is right choice.

Option J is right choice.