exam Maths Puzzle Numerical Ability

I am trying to graph the following quadratic equation xsquared - 4 = 0
i am instructed to find the related function
axis of symmetry

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exam Other Question

Solve by graphing.
2x+y=1
x-y=2 Please help me solve this problem:

An elevator went from the bottom to the top of a 240 meter tower, remained there for 12 seconds, and returned to the bottom in an elapsed time