Solve the problem.In the study of electrical circuits, the impedance of electron flow in an alternating-current (AC) circuit is expressed as a complex number. The total impedance in an AC circuit connected in series is the sum of the individual impedances. If the impedance in one part of the circuit is 
ohms and in another part is 
ohms, what is the total impedance in the circuit?
A. (-20 + 21i) ohms
B. (-10 + 7i) ohms
C. -10 ohms
D. (-10 - 7i) ohms
Answer: B
Mathematics
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y = 2cos (2? t ) + 3 4
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