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

Develop a height equation: A ball thrown upward from the roof of a building 100m tall with an initial velocity of 20m/s. When will the ball reach a height of 80m? How would you solve this. I got 0 & -1 but they dont plug in the solution right.
5x^2-5x=0