A solid, S, is made from a hemisphere and a cylinder. The centre of the circular face of the hemisphere and the centre of the top face of the
cylinder are at the same point

(20 - 4x) cm
The radius of the cylinder and the radius of the hemispheres are both x cm.
The height of the cylinder is (20 - 4x).
The volume of S is " V " where
V=1/3 xy.
Find the maximum value of y.
Show clear algebraic working​

1.) 18+5 is one way i’m pretty sure there are others but i can’t think of them right now

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4, -4 is the other point it would pass through