I NEED THIS ASAP!!! PLEASE ANSWER FAST!!
A gym charges its members a one-time $20.00 sign-up fee, and $25.00 per month. The function rule f(x) = 25x + 20 describes the relationship between the number of months x, and the total cost of membership f(x). If a gym member paid $170.00, for how many months did the gym member pay?

A. 4 months
B. 5 months
C. 6 months
D. 7 months