Apuppy pen is 4 square feet wide and 5 feet long. is 21 square feet of fabric large enough to make a mat for the pen? explain

Yes because the area of the puppy pen is only 20 hope this helps!

Yes, length times width equals the area of a square or rectangle. so 4 feet times 5 feet is 20 feet squared, so you will have some fabric left over.

6(2x + 5y)6 (2x) = 12x6 (5y) = 30y12x + 30y