Write an integral that could be used to calculate the area bounded by $y=cosx,$ the $y-$axis, $y=x-1$ and $x=1.$

Write an integral using the $y$ variable, that could be used to calculate the area bounded by $x=y^2$ and $x=9.$

Given the base of a solid bounded by $y=\sqrt[\phantom{2}]{x},x=9,$ and the $x-$axis, write an integral that could be used to find the volume of the solid if all of the cross sections perpendicular to the $x-$axis are semi$-$circles