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# Help

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Four years ago you invested some money at $10\%$ interest. You now have $\$439.23$in the account. If the interest was compounded yearly, how much did you invest 4 years ago? Given that$f(x) = (\sqrt 5)^x$, what is the range of$f(x)$on the interval$[0, \infty)$? Guest Apr 8, 2018 #1 0 PV = FV / [1 + R]^N PV =439.23 / [1 + 0.10]^4 PV =439.23 / [1.10]^4 PV =439.23 / 1.4641 PV =$300 - what you invested 4 years ago @ 10% APR.

Guest Apr 8, 2018