Let the total ribbon Zoe had was x feet.
Out of x feet, she used 3/8 part of it.
Hence, 
3/8 part of the original ribbon is equal to 9 feet.
Hence, we get

=> Multiply 8 on both sides.

Divide both sides by 3


Zoe had 24 feet of ribbon in starting... Answer
Answer:
Option C. 
Step-by-step explanation:
we have
-----> equation A
-----> equation B
Solve the system of equations by graphing
Remember that the solution of the system of equations is the intersection point both graphs
The intersection point is (1,3)
see the attached figure
therefore
The solution of the system of equations is

Find the difference

The answer is B.
Whatever the x value is you have to add 9 to it.
Try to divide 62.01÷ 9 and then do it with the other one
In this sequence you are adding 4 to the previous number. That means that to find the next number, you will have to add 4. The next number is 21, the one after that is 25, the one after that is 29