hiiii please help

[lilac lark]

Can anyone show me how to solve these?

[lean arrow]

For the 1, you have to found the area, no?

Like you do, 6*9

@lilac lark

[lean arrow]

My friend found this V(x) =(9−2x)(6−2x)⋅x

[vestal lynx]

For 1.) the volume of a cuboid is length multiplied by breadth multiplied by height

In this diagram you can see length is 9-2x

Breadth is 6-2x

And height is x

So the function is self explanatory

[vestal lynx]

For q2.) find h in terms of r