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

State the domain and range.
F(x)=-x^2+3
One number is 5 more than twice another and their sum is 23.
Find the numbers.

please and
thank you!!