At the end of month 11 she will have $911.
Recall you need to write complete question in order to get exact answers. In this exercise, I'll assume that the complete question is:
Makayla started a saving account. She starts the account with $20 and adds $80 at the end of each month. She will not remove any money from the account. How much money will she have at the end of month 11?
So, she starts the account with $20, that is, this is a fixed amount of money and at the end of each month she adds 80$. So:
Let:
m: Represents the months.
s: Represents the amount of money that is saved.
We can write an equation:
[tex]s=20+80m[/tex]
So, at the beginning of the process [tex]m=0[/tex] so she have:
[tex]s=20+80(0) \\ \\ s=20[/tex]
But at the end of month 11 she will have:
[tex]s=20+80(11) \\ \\ s=20+80(11) \\ \\ \boxed{s=911}[/tex]
So at the end of month 11 she will have $911.
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