exam Maths Puzzle Numerical Ability

Please help me with this problem!
The vector v is represented by the directed line segment PQ. Write v in the form ai + bj and find ||v||. P = (-3,1) Q = (4,-2)
Thank you, Tami

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exam Other Question
Rose's garden is in the shape of a trapezoid. If the height of the trapezoid is 16 m, one base is 20 m, and the area is 224 m to the second power, find the length of the other bas (15-5)/[(12/2*2)-2]