In Exercises 83-86, use the formula for the nth partial sum of a geometric series
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Annuities
When an employee receives a paycheck at the end of each month, P dollars is invested in a retirement account. These deposits are made each month for t years and the account. This deposits are made each month for t years and the account earns interest at the annual percentage rate r. When the interest is compounded monthly, the amount A in the account at the end of t years is
When the interest is compounded continuously, the amount A in the account after t years is
