L=2.5*w, p=2l+2w. Plug in your known value for l, p=2(2.5w)+2w=5w+2w=7w. Now solve for w, p/7=(7w)/7=w. Plug in your perimeter, w=p/7=28/7=4. Plug in your width into your equation for length. l=2.5w=2.5(4)=10. Your length is 10 feet.
The common denominator of 6 and 9 is 18.
2/5 + 1/3
= 6/15 + 5/15
=11/15
9 4/9
1. convert 3 1/3 to have a denominator of 9
2. 3 1/3 x 3/3 = 3 3/9
3. 6 1/9 + 3 3/9 = 9 4/9