book Maths Puzzle Numerical Ability

Is there any square number besides 9 and 81 that is divisible by 9?

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book Other Question

I dont understand how you solve equations by using multiplication and division...Can you help me understand it? I have been working on this problem for a week and I still can't figure it out. This is what I have so what am I doing wrong?

Let the function f be defined by f(x) = 1/(sqrt1-x^