Use the figure to find m.

m = 10

Step-by-step explanation:

Since this is a right triangle, we can use trig functions

cos theta = adj side / hypotenuse

cos 30 = 5 sqrt(3) / m

m cos 30 = 5 sqrt(3)

m = 5 sqrt(3) / cos 30

m = 5 sqrt(3) / sqrt(3)/2

m = 5 / (1/2)

m = 10

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the answer to that one is b