Answer
$c$=$\sqrt {21}$
Work Step by Step
$\int^c_3\frac{1}{6}xdx$
=$\frac{1}{12}c^2-\frac{3}{4}$
solving $\frac{1}{12}c^2-\frac{3}{4}$
=$1$
we find $c$=$\sqrt {21}$
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