exam Maths Puzzle Numerical Ability

How do I write systems of equations in matrix form?

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exam Other Question

Please simplify.
4/the square root of 2-the square root of 6
no book

What was the percentage increase in the age 75+ population of Europe from 1970 to 1995?
22,762 in 1970
38,139 in 1995
Thank you for your help!!!!