The area of the room is square feet so Michelle's reasoning was incorrect.
Step-by-step explanation:
Step 1:
To calculate the area of the given room, we divide the unknown shape into known shapes.
The room's shape is made of 2 rectangles.
The area of a rectangle is the product of its length and its width.
One rectangle has a length of 10 feet and a width of feet.
The other rectangle has a length of feet and a width of feet.
Step 2:
The area of the first rectangle square feet.
The area of the second rectangle square feet.
The total area of the room square feet.
The area of the room is square feet so Michelle's reasoning was incorrect.