
Arturo O. answered 12/12/16
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z = 7[cos(π/6) + i sin(π/6)]
cos(π/6) = (√3)/2
sin(π/6) = 1/2
z = 7[(√3)/2 + i(1/2)]
z = 7(√3)/2 + (7/2)i
The correct answer is (B).