book Maths Puzzle Numerical Ability

What do you mean by "Complex numbers can be identified with a certain set of matrices. If we think of the regular identity matrix as the number 1, and we think of i which we introd

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A retiree divides his pension portfolio of $270,000 between a conservative mutual fund paying at a rate of 4% and high risk bonds paying at a rate of 8%. Both investments pay the same amount of interest anually. How much is invested in each investment? What is the square root of x to the sixth?