Ydx-4(x+y^6)dy=0
how can i solve?

-4y^(6)+dxy-4x is your answer all you have to do is simplify  your answer

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