On Roy’s first birthday, his grandfather placed $100 in a bank account. On Roy’s second birthday, his grandfather placed $80 in the account and continued to place $80 each passing year. The arithmetic sequence 100,%E2%80%88180,%E2%80%88260,%E2%80%88340,… indicates the account balance for the first four years. Create a function that models this situation.(1 point)%0D%0AResponses%0D%0A%0D%0Af(n)=80(100)n−1%0D%0Af left parenthesis n right parenthesis equals 80 left parenthesis 100 right parenthesis superscript n minus 1 baseline%0D%0A%0D%0Af(n)=100+(n−1)80%0D%0Af left parenthesis n right parenthesis equals 100 plus left parenthesis n minus 1 right parenthesis 80%0D%0A%0D%0Af(n)=100+80(n)%0D%0Af left parenthesis n right parenthesis equals 100 plus 80 left parenthesis n right parenthesis%0D%0A%0D%0Af(n)=80+(n−1)100

Answer 1

f(n)=100+(n-1)80