exam Maths Puzzle Numerical Ability

This is asking to find the distance between (6,0)and (-7,0)

I am getting stuck on the first step, how do bracket (0,0)?
please help

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exam Other Question

x+4/x^3-3x^2-4x+12 + 3/x^2-5x+6 = 3x/x^2-4.

This problem is not working out for me, I come up with x^2+3x+8=0 plot intercepts to graph equation: x+y=5
plot intercepts to graph equation: 6x-4y=-12

graph linear equations: f(x)=4x+2
graph linear equations: f(x)=2x+6

thanks.