exam Maths Puzzle Numerical Ability

right now were doing matrices and i was wondering if i got the answer right the problem is
and this is the answer i got:
[1 2 3] [ 0 -1 2

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exam Other Question

how do you draw an acute scalene triangle NDK and construct a segment from c perpendicular to ND the sum of the digits of a two-digit nimber is 12. the value of the number is five more than 10 times the tens digit. find the number