Honors pre calc summer homework help? Please Help!?

In electronics, the total resistance to the flow of electricity in a circuit is called the impedance, Z. Impedance is represented by a complex number. The total impedance in a series circuit is the sum of individual impedances. The impedance in one part of the Z1=3+4i. in another part of a circuit the impedance is Z1=5-2i. What is the total impedance of the circuit?

Please show me how to do it not just the answer :) P.S. Z1 is Z with a subscript 1
 
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