exam Maths Puzzle Numerical Ability

square root of -25

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exam Other Question

Help with this matrix would be much appreciated!

find and write the linear system corresponding to matrix and solve it

[1 0 0 | 7 ]
[0 1 0 | -3 ]
[0 0 2 | 6 ] carpet sells for $28.50 per square yard what is the approximate cost of a square foot????