Answer:
5/84
Explanation:
The formula to calculate the square foot is lenght x width
you have that width is 21/2
Square Footage = 5/8
then,
5/8 = 21/2 * x
if you solve this equation you have that x= 21/2 ÷ 5/8 which is equal to x=5/84 Our x represents your length, so the length of your rectangule is 5/84