exam Maths Puzzle Numerical Ability

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if r = 5z then 15z = 3y, then r = ?

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I have to solve x^2/(0.01-x) by using the quadratic formula. Ive done this problem five times and never get the answer the teacher does. What I did was 0=-x^2-x+0.01 and t Hi again, I have one more question that I feel I know the answer, but I wanted other opinions on it. Here's the question:

Let A be the augmented matrix associated with a HOMOG