A).
Area of a rectangle = (length) x (width)
72 square feet = (9 feet) x (width)
Divide each side of this equation by (9 feet)
and you have:
(72 square feet) / (9 feet) = width .
You can finish this off and find the width.
Once you know both the length and the width,
you're ready to go on to part-B.
B).
The perimeter of a rectangle is the distance all the way around it.
If you start at one corner and walk all the way around it, you'll
have to walk the length 2 times, and the width 2 times.
You know both the length and the width of the class mural,
so you can easily find the perimeter.
