Check my answer please.

Question

vera_ewing · Answer

Jennifer has been saving for college for 57 months. The first month, she saved $11. She was able to save more money each month than the month before. She ended up saving $19,779.00. How much more did she save each month? 

Is it $12.00?

dan815 · Answer

did u do geometric series or arithmetic series

vera_ewing · Answer

Yes. Just need to make sure it is $12.00
Can you check for me please?

dan815 · Answer

the answer will be an expression like f(n) for n=the month number

dan815 · Answer

every month she will save a different ammount

dan815 · Answer

you have to get an expression based on the month

vera_ewing · Answer

These are my answer choices. But they don't have f(n) for n= ???
A.	$11.00
B.	$11.50
C.	$12.00
D.	$12.50

dan815 · Answer

okay well lets just see what we get with an airthmetic series then

vera_ewing · Answer

What did you get?

dan815 · Answer

11+(11+r) + (11+2r) + (11 + 3r)|dw:1431651284415:dw|