exam Maths Puzzle Numerical Ability

A cylinder with a height of 15 and a diameter of 20 is placed inside a 20 cm cube. What percent of the volume of the cube is not taken up by the cylinder?

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exam Other Question

For the function f(x)=x^2-8, construct and simplify the difference
quotient f(h+h)-f(x)/h
The difference quotient is=
Identify the axis of symmetry, create a suitable table of values, and sketch the graph (including the axis of symmetry).

y=x² +6x - 2