interest - graph on calculater and effective yield

i need some help...

compare saving plans: for instance, you deposit $1000 in a savings account and the following options are given:

a. 6.2% annual interest rate, compounded annually

b. 6.1% annual interest rate, compounded quarterly

c. 6.0% annual interest rate, compounded continuously

1) Use a graphing utility to graph all three functions in the same viewing window. Can you find a viewing window that distinguishes among the graphs of the three functions? If so, describe the viewing window.

*>how to put that in the calculater?(ti-84 plus)*

>is there a window which shows that?

2) The effective yield of a savings plan is the percent increase in the balance after 1 year. Find the effective yields for three options listed above. How can the effective yield be used to decide which option is best?

thank you