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Answer:
(a) 3·sin(66°)/sin(38°)
Explanation:
Put the given values into your Law of Sines equation and solve for BC.
sin(66°)/BC = sin(38°)/3
3·sin(66°) = BC·sin(38°) . . . . . multiply by 3·BC
BC = 3·sin(66°)/sin(38°) . . . . . divide by sin(38°)