book Maths Puzzle Numerical Ability

How do you find the area of a quadrilateral with no even sides? an example is ten by 9.9 by 4.5 by 9. please give this back as soon as possible.

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book Other Question
the value of a building lot this year is $78,000. this is three times its value 18 years ago. find its value 18 years ago. Find slope given the following points: (2.5) and (2.1)