How do you know if you have to distribute in an equation? What would you see?

What two criteria are needed for triangles to be similar

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

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?