exam Maths Puzzle Numerical Ability

It has infinity over top of the sigma Notation then on the side it has (�)^k-1 then underneath k=1 you want to find the sum?

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exam Other Question

Can someone help me divide this rational expression?

x^2+2x-15/4x^2 Divided by x^2-25/2x-10

Thanks! I always have problems with these!
ac please help to solve

3x = 18 - x^2