A principal of 250 OR is deposited in an account that pays 0.064 interest compounded yearly. Account balance function in response of time (years)is f(x) = P(1+r)* P: initial value r: interest compounded yearly x: time in year a. Find the account balance after 5 years. b. By graphing show if the Account balance function is increasing or decreasng. c. After how many years the account balance will be 12000 OR.

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