exam Maths Puzzle Numerical Ability

Well, I'm really not doing just average I am doing weighted averages and I need some help or give me some examples and maybe I can go from their.

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exam Other Question

Find the axis of symmetry.
Y=x^2 + 5x -9

I am not understanding how to find the axis of symmetry and would like some help with this to understand this better. Thanks. 72 is increased to 117. Find each percent of increase. where necessary, round to the nearest tenth of a percent.