Evelyn took a job that paid $100 the first week. she was guaranteed a raise of 2% each week. how much money will she make in all over 8 weeks? (round your answer to the nearest cent.)

This is a growth exponential equation. 
It can be solved 2 ways, but one of them is long and cumbersome and not worth the effort. You could take 2% of the base number and keep doing it 8 times. 

The other way is to realize that 100$ + 2% of 100 dollars can be written as 2% = 2/100 = 0.02 and that can be written as
100( 1 + 0.02 ) = 100(1.02) Now if you want this to be raised 8 times, it will look like this
y = 100(1.02)^(n - 1) for any number of weeks
y(8) = 100(1.02)^7 = 114.87
So at week 1 she has 100 dollars and at week 8 she has 114.87 dollars.

Comment
Realize that if her boss does not want to give her compounded interest that she could still make
Ln = L = 100 + (n - 1)*0.02*100
L = 100 + 7*0.02*100 = 100 + 14. = 114
By compounding she makes a whole 0.87$ more.