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

can someone please help me with this problem:

Evaluate the function at the given value of the independent variable and simplify.

f(x) = -5x + 8; f(-3)

a. 23
b. -9
c. 3
d. 7
find the positive root of the equation 4x^2-36=0