The expression x/x+4 is equal to zero when

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

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

With finding limits of multi variable !