Convert the Riemann sums described below into sigma notation.

$(a)$ A right$-$endpoint Riemann sum estimating the area under $y=5x^3+2$ between $x=0$ and $x=240$ using $30$ rectangles $of$ equal width.

$(b)$ A right$-$endpoint Riemann sum estimating the area under $y=sin(x)$ between $x=2$ and $x=32$ having $x=2.$

$(c)$ The right$-$endpoint Riemann sum $ofy=\sqrt[\phantom{2}]{x}$ shown below.

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