1 Word problem and 1 function problem

you guys are all very good at math, i love these forums. I understand more things here then i do most the time in class, i have a test coming up and i really need help understanding these 2 problems, can someone please solve these problems and explain the steps, i would really appreciate it.

i got a review packet, i scanned the problems because i dont know how to type them

http://img694.imageshack.us/img694/9...wrk2222222.jpg

problem #28 and #29 are the ones im having problem with and need the help.

also was i correct with #27? was it A? thanks everyone