Joe and Steve are saving money. Joe starts with $105 and save $5 a week. Steve starts with $5 and saves $15 per week. After how
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and is all you can simplify from it.
so... all we did, was rationaliize it, namely, "getting rid of the pesky radical at the bottom", we do so by simply multiplying it by something that will raise the radicand, to the same degree as the root, thus the radicand comes out.