Differentiate. 16) f(x) = (3x-5)(2x3-x2 + 1) 17)g(x) =- 18) f(x) = (2x2 +2)3 19) f(x) = 1-18x 20) f(x)=ax-3)4 2 x-11 (2x- 3)4

Tim open up a new saving account with a $50 deposit and plant to deposit $20 per week into the same account. write an expression to represent the total amount in his savings account.