Sorry it's a bit messy. but I hope you understand and it will help
True. The formula for the area of a rectangle is length multiplied by width. Therefore, we can find the width by dividing the area by the length through Division Property of Equality.
Looking at 49 and 21, you immediately know that 7 can be divided out of both.
49:21
=49/7:21/7
=7:3
7:3 is the answer.
Hope this helps!
Alex is making a square with 4 corners, brittanie is making a triangle with 3 corners. That's the difference, hope it helped a little, it's not a full answer but maybe it will help.