Posted by **Anonymous** on Tuesday, May 21, 2013 at 1:47pm.

If x dollars is deposited every four weeks (13 times a year) into an account paying an annual interest rate r, expressed in decimal form, then the amount An in the account after n years can be approximated by the formula .If $45 is deposited every four weeks into an account paying 9% interest, approximate the amount in the account after 10 years.

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