How can you describe and represent a situation using rational functions?

Answer 1

$150 invested in the stock market each month for 40 years accumulated to how much?  The historical compounded annual return of the S&P 500 stocks including dividends for the last 40 years has been 11%.

S= 150(1 + i/12)^t - 1)/(i/12), i= annual interest rate, t= months

i= 0.11, t= 480, S= $1,290,019