exam Maths Puzzle Numerical Ability

Can someone please provide me with an example of a composite function step by step solution

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exam Other Question

Identify the axis of symmetry, create a suitable table of values and then sketch the graph,(including the axis of symmetry.)
y=x^2-4x 1/ the product of 25.26 and 3/8
2/ 27^33+15(3645sqrt64)
3/ 3+4^24(sqrt81-(3x6)^2+21x47)
4/ plot each of the following on a number line
-1/6, pie, -3/7, 0.1^2, -sqrt3

thanking you in anticipation to these problems.