Help please I don't know what the answer could be

Which value of c would make he following expression completely factored? 8x+cy

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

How is the number of vertices for a prism related to the name of the prism