how to use iterated integral to find area of a region?

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Use iterated integral to find area of a region bounded by $y=\sqrt{x}, y=3, x=0$, and $x=4$. sketch the region.

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It's the area of a rectangle, i.e it is $(3-\sqrt{3})(4-0)=4(3-\sqrt{3})$. Although not necessary in integral form we have $\int_{0}^4\int_{\sqrt{3}}^3dydx$. https://www.desmos.com/calculator/rul8ankcel