Answer
$R(x)=\displaystyle\frac{L(x)}{P(x)}$
Work Step by Step
We express the sentence as an equation:
$\displaystyle Participation\ rate(R)=\frac{size\ of\ labor\ force(L)}{civilian\ population(P)}$
$R(x)=\displaystyle\frac{L(x)}{P(x)}$
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