book Maths Puzzle Numerical Ability

What is the distance between (2,-3) and (1,2)

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book Other Question

I am not sure how to solve this one

ln (square root of x +4) =1

and

log base 2 (x-3) + log base 2x - log base 2 (x+2) =2 I don't understand the problem, I have tried and tried but can't get the answer right