exam Maths Puzzle Numerical Ability

A quadrilateral with vertices at A(0,0), B(2,4), C(8,5) and D(6,1).
What is the area of ABCD? Please help. Thanks.

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exam Other Question

3x+4=2x-3 The volume of a cube is given by V= s to the 3rd power . Find the length of a side of a cube if the Volume is 729 cm to the 3rd power.

Answer:

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This problem has me baffled as well.