Zeke is seated 12 feet directly behind Tina and 5 feet directly left of Cody. How far is Tina from Cody?

How do you solve a question like this?

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

The anwser cause i do not understand just plez