exam Maths Puzzle Numerical Ability

This problem is giving me some trouble, will someone please help!
Which of the following describes the sequence:
5, (-5/3), (5/9), (-5/27), (5/81),...
1. Grometric, r=(-1/3)
2.

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exam Other Question

Divide this trinomial
(8x^3-6x^2+2x)/(4x+1)
I need to know this it says find the GCF of the terms of each polynomial.
4n4 + 6n3 -8n2

please let me know what it should be..

Thank You Eddie