exam Maths Puzzle Numerical Ability

One number is 5 more than twice another and their sum is 23.
Find the numbers.

please and
thank you!!

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exam Other Question

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 Factor completely:
9x2 - 36y2