exam Maths Puzzle Numerical Ability

Find the inverse (A^-1) if the following matrix.

A=[3 1]
[-1 2]

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exam Other Question

how we can do minimization of multiple variable function with constraint Dylan sells $1,000 ads for the radio station he works for. He earns $566 per week, plus four percent commission. In the last six weeks, Dylan earned $6,516. How many ads did he sell?