exam Maths Puzzle Numerical Ability

please simplify 1/ 2- i

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exam Other Question

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. What is the y-intercept of -1/6(y+3)=(1/2)^x-3???? I think the answer is (0,-51) BUT I am not sure :(