Does anyone understand how to set up number 2?

The equation respenting the left table is

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)