## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

R($x$) = $\frac{L(x)}{P(x)}$
Since participation rate (R($x$)) is defined as the number of people in the labor force (L($x$)) divided by the civilian population (P($x$)), thus, R($x$) = $\frac{L(x)}{P(x)}$