To re-phrase this: 50 is a certain percent of 90.
this can be written mathematically as 50=x%*90
let's divide both sides by 10:
5=x%*9
and divide both sides by 9:

which in decimals is approximately 0.56 (but not exactly).
so 0.56=x%
and the x then 56
so 50 is
approximately 56% of 90:
exactly 56%of 90 is 50.4
Answer:
The correct answer is B.) (4x - 7 + 5x + 5) and (9x + 12).
I don't have an idea of what the answer is to be honest.
I'M not sure sorry i just keep getting
1/4x