book Maths Puzzle Numerical Ability

what is i to the 16th power?
What is i to the 255th power?
What is i to the 5692nd power?

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book Other Question

Find the first five terms of the sequence for which a(1)=5 and a(n+1)= 3a(n)+1.

Thank You I am having difficult with the following:

(-5/6) -:- (-7/18)

I have many exercises to do that are like these and would like to get a grasp on how it is answered, in the simplest form.