Answer:
it is a relationship where the first difference is equal and the second difference is 0
7/12 is less than 3/4.
Check: 3/4 is same as 9/12. Clearly see that 7/12 is less than 9/12
I think the answer would be 15, 8•15=120, leaving 3 points left which would be an multiple choice question, hope this helps:))
Answer: 
<u>Step-by-step explanation:</u>

NOTE: The sign between 4x and 7 is missing in the question you posted. I assumed it was 4x + 7 in order to solve the equation.