4b-5+2b=10

me solve this. i'm thinking way to hard.

Isolate the variables. You want to get the five on the same side as the ten, so, you add  five to both sides.

-4b+2b=15

-2b=15
b= -7.5

I believe. You may want to double check my work though.

The answer is c because you turn 17.5% into a decimal which gives you .175 then you times that by $361.35 which gives you 63.23625 but then you round that which gives you 63.24. then you at 63.24 pulse 361.35 and you round it which gives you $425