2: Cis directly proportional to D.
1 answer:
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Answer:
B) 20 + 15i
Step-by-step explanation:
So first you need to foil the equation (a + bi)(c + di) = ac +adi +bic +bidi. then you need to combine like terms. Remember that i^2 = 1 and i = i.
Then write your final answer in the terms a + bi
