exam Maths Puzzle Numerical Ability

Please simplify.
4 x the square root of -3 + 2 x the square root of -27

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exam Other Question

I need some help with this problem please.

Find a value for k so that 9m^2 - kn^2 will have the factors 3m + 7n and 3m - 7n.

I am not sure how to solve this can you help? Thank you. The diameter of the Milky Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling at 10^16 m/year to travel across the diameter of the Milky Way?

900