How to do graph exponential functions

Which fraction below is equivalent to 10/12?

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

Bill works as a waiter and is keeping track of the tips he ears daily. about how much does bill have to earn in tips on sunday if he wants to average $22 a day? tips by day tips (dollars) monday tuesday wednesday thursday friday saturday $14 $22 $28 $36