book Maths Puzzle Numerical Ability

What is the formula to find the distance between 2 points on a graph. For example the points are (-2,5) & (-3,-1)

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book Other Question

The vector v has an initial point P and terminal point Q. Write v in the form ai+bj; that is, find its positive vector.
P=(-2,-1);Q=(6,-2) What are the first five terms of the sequence with a(subscript1) =3, a(subscript n+1)= a(subscript n)+ 5