exam Maths Puzzle Numerical Ability

Find the determinant of the matrix.

A=[-2 5]
[3 7]

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exam Other Question

Solve by elimination..
3x+2y=9
-x=3y=8 While only 19 year old, Carl Friedrich Gauss proved in 1796 that every positive integer is the sum of at the most three triangular numbers.
a) Express each of the numbers 25 to 35