book Maths Puzzle Numerical Ability

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Simplify and evaluate:
(x3y-4z0/5x6y8)3

Thank you in advance.

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Hello-
This one I made myself, though I can't seam to find one formula to cover it. I have the answers, but if you could give me the formula, i'd appreciate it!

James owns 8 d
Let x1 < x2 <.....<xm, For i = 1,......,m, define linear operators Ti: Pn(R)--> R^1 by TiP=P(Xi). If m<=n, show that (T1,....,Tm) is linearly independent. What happens if m> n? exp