27. (a) w + z = 6 - 2*i

(b) w - z = -2 - 4*i

(c) w*z = 11 - 10*i

(d) w/z = (2 -3*i)/(4 + i) = ((2 -3*i)/(4 + i))*((4 - i)/(4 - i)) = (5 - 14*i)/sqrt(17)

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