$(10$ pts$.)$ Specify the differential area$($s$),dA,$ and moment arms, tilde$(x)$ and tilde$(y),$ that you would use to calculate the location of the centroid of the shaded area, $\stackrel{}{x}$ and $\frac{?}{\text{b}\text{a}\text{r}}(y).$ State any $dA,$ tilde$(x),$ and tilde$(y)$ as a function of a single variable, either $x$ or $y.$ DO NOT CALCULATE THE CENTROID.

$y$

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Problem $4.$