# Chapter 7 - Section 7.2 - Rational Exponents - 7.2 Exercises: 66

$r$

#### Work Step by Step

$\bf{\text{Solution Outline:}}$ Use the laws of exponents to simplify the given expression, $r^{-8/9}\cdot r^{17/9} .$ $\bf{\text{Solution Details:}}$ Using the Product Rule of the laws of exponents which is given by $x^m\cdot x^n=x^{m+n},$ the expression above is equivalent to \begin{array}{l}\require{cancel} r^{-\frac{8}{9}+\frac{17}{9}} \\\\= r^{\frac{9}{9}} \\\\= r^{1} \\\\= r .\end{array}

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