The area of the parallelogram can be found using the formula:
Area = base x height.
The area is 24, and the height is 3. Isolate the base. Note the equal sign. What you do to one side, you do to the other. Divide 3 from both sides
24 = b x 3
24/3 = 3b/3
divide
b = 24/3
b = 8
8 feet is your base
hope this helps