exam Maths Puzzle Numerical Ability

I really need help to solve the following

-k(-2-3) - (-2)(-k-5) = -2-(-2k+4) + 3 times the square root of -27

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exam Other Question

i have been working on the problem and not figuring out where they got there answer if someone could explain it to me...... (3x+7)exponent of 2 outside of () how much does an obtuse angle measure