## College Algebra 7th Edition

Published by Brooks Cole

# Chapter 1, Equations and Graphs - Section 1.10 - Modeling Variation - 1.10 Exercises: 17

#### Answer

$\displaystyle R= \frac{kP^{2}t^{2}}{b^{3}}$

#### Work Step by Step

Since $R$ is directly (jointly) proportional to the squares of $P$ and $t$, but inversely proportional to the cube of $b$, we have: $\displaystyle R= \frac{kP^{2}t^{2}}{b^{3}}$ (where $k$ is a constant.)

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