If you use your computer's calculator, do the following. Display the Scientific View. This should make the calculator larger and with more functions. Next, enter 1.333 and then press the blue "log" button. This gives the answer of .1248. In the equation, to bring the n down, you would have to take the "log" of both sides. I don't know were the 4 comes from but hopefully that helped some. Good Luck!

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