book Maths Puzzle Numerical Ability

Write an expression of the sum of 2 consecutive even integres where 2x is the lesser integer
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book Other Question

I am not certain of the steps for this;
ar^2 - brs + ars - br^2 = ar^2 + ars - brs - br^2

Thanks,
ttsj Find the value of a if the points whose coordinates are given are the indicated distance apart.
(-2,-5)(a,7);d=13