exam Maths Puzzle Numerical Ability

Hello out there,I need some help with a couple of problems,the first one is,Name the set or sets of numbers to which the given real number belongs:0.1,is it real,rational or real,r

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I have been struggling on how to do this problem and I was wondering if someone could help me? Please and Thank You!! I would deeply appreciate it!!

Let f(x)=x^2-1 and g(x)=1-2x. Find the idicated values.
g(1/f(3)) 1.All squares are rectangles.
2. If a quadrilateral is a ractangle, then it has congruent diagonals.

I do not understand how to come to a conclusion on the question.
it says t