Sammy opened a college savings account. She opened the account with $85, and then

deposited $45 each month. Which equation best models the relationship between m, the

number of monthly deposits Sammy made, and S, the total amount in Sammy's college savings

account?

A. s= 85m - 45

B. s=45m - 85

C. s= 85m + 45

D. s= 45m + 85