7) $450 is deposited at 5.6% annual simple interest. a) Write an expression to compute the accumulated value of the account at any time t. b) Graph this expression. What sort of function is it? c) Find an expression for the effective rate of interest earned in period n. d) Evaluate your expression c) for n = 1,2,3. e) Graph the expression in c) over the range n = = 1 to n = 20.