Please help me out and make sure to show your work! Thanks.

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

You can find the constant of proportionality by finding the ratio of

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)