exam Maths Puzzle Numerical Ability

Hello,
I know the answer to one of these, and the others I'm not sure of. Can you please help me work them out in simplest form?

1) (-5 - √-9^2) answer is 30 + 16i?

2)

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exam Other Question

Refer to the graph given below and identify the graph that represents the corresponding function. Justify your answer.
y = 2x
y = log2x Determine the measure of side b, given the following informaiton for triangle ABC:
c=59ft, A=65degrees, B=65degrees