book Maths Puzzle Numerical Ability

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)

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how do i do this problem?

{{{20x^3}}} over{{{4xy^2}}} x (times) -6xy over -x




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