# Chapter 5 - Review - Page 407: 121

width $= 5x-1+\frac{20}{x^2}$ feet

#### Work Step by Step

Area = length $\times$ width $(15x^3-3x^2+60) = 3x^2 \times$ width width $= \frac{15x^3-3x^2+60}{3x^2}$ width $= 5x-1+\frac{20}{x^2}$

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