exam Maths Puzzle Numerical Ability

At the Northside assembly plant 5% of the workers were classified as minority, while at the Southside assembly plant 80% of the workers were classified as minority. When Northside

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exam Other Question

Sketch the graph of the soulution set of the system of inequalities.

{ -3 < x < 2
y <0}
If A is an nxn matrix, prove that
det(adjA)=(detA)^n-1.
I was working with the formula of A^-1 but I don't get anywhere!
Thanks in advance for the help!!