book Maths Puzzle Numerical Ability

can you solve n(n+15)=?

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book Other Question

Please show all work</b>

Add. 3/x + 2 - x/x - 3


Any help would be greatly appreciated. Thank you for the kindness!
Show that the rank of the transpose of the following matrix is the same as that of original matrix.

4 1 2
-3 2 4
8 -1 -2