book Maths Puzzle Numerical Ability

My question says to simplify the radicals.

4 square root of 3+2 square root of 12

Could you help me? thanks!

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book Other Question

a plane flies 465 miles with the wind and 345 miles against the wind in the same length of time. if the speed of the wind is 20 mph, find the speed of the plane in still air. how do I do:
x=-3y+10
-x+y=-10

using the substitution method