Please help me with 19 and 20!!

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

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth

With finding limits of multi variable !