Electrical engineers find it convenient to model impedance with complex numbers. In a parallel AC circuit with two impedances 21 and 22, the equivalent or total impedance in ohms can be determined by using the Z₂ Z2 formula Zeg Find the equivalent impedance Zeg for 21 = 2-i and 21-22 22 = 1 + i arranged in a parallel AC circuit. The equivalent impedance in a parallel AC circuit is Zeq = i.

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.