Is the following function exponential?

6x - 8 = 16 solve the following equation. then place the correct number in the box provided.

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Hey hotel charges guests $19.75 a day to rent five video games at this rate which expression can be used to determine the charge for renting nine video games for one day at this hotel? pls