book Maths Puzzle Numerical Ability

i dont get the i'-4 how would you simplify that?

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Find the center, vertices, and foci for the ellipse.
9x^2 + 100y^2 = 900 I need help with this question on exponents and roots, My question is Simplify the expressionThe square root of 96/8? This is supose to be a fraction, please help me if you can, Please.