exam Maths Puzzle Numerical Ability

A life saver has a 3cm diameter, a 1cm diamter hole and has 1/2 cm height. Find the volume and total surface area of the life saver. (Just like the candy lifesaver) That is what the pic looks like.

Thankyou Shelly

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exam Other Question

Subtract
4x³ +2x² + 4x³ from
4x³ + x -3x²
A) When using elimination to solve a system of equations, how would you recognize it has not solution?

B) Infinitely many solutions?