The error is that 9 shouldnt be written as nine it should be written as 3x3 or 3^2. So the answer should be 2^3 x 3^2 because 9 can be divided into even more prime factors of 72.
I think you mean:
A parking lot is 100 yards long. What is the length of 3/4 of the parking lot?
3/4 * 100 Mathematical Expression.
3/1 * 25 Simplify.
75 Multiply.
Final Answer: 75 yards long