Answer:
5.7 feet
Step-by-step explanation:
Total cloth area recquired to make a bag and a towel is 22.23 square feet
Given the area of the cloth recquired to make the bag is 5.13 square feet.
The area of cloth recquired to make the towel is = 22.23-5.13=17.1 square feet
given the height of the towel = 3 feet
let the length of the towel be x
We know that 
area=3x

therefore the length of the towel is 5.7 feet
An example of the difference of squares would be: a^2-b^2 = (a+b)(a-b)
The answer you are looking for is
24 - 16 = 8
The percent increase is 8