book Maths Puzzle Numerical Ability

69,92,64,78,80,82,86,93,75,80,80

what is the maximum,minimun,and range of this data

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book Other Question

16-x squared/x cubed-2x squared-8x I am struggling with this proof, please help!

Prove that the row vectos of an n x n intertible matrix A form a basis for R^n

Thank you!
Glenna