X/4 = -9
x/4 = -9/1
cross multiply
x = -36
You can't convert miles into gallons those are two different units of measurement.
Answer: 
This means that he has to save at least $88 or more to have enough money.
Step-by-step explanation:
He has $37 and he needs to save more (+) but we don't know how much more that is, so that's why that is our unknown value. (x). The sum of them has to be at least 125 or greater.

Subtract 37


F - 12 = -35
f - 12 + 12 = -35 + 12
f = -23