If f(x) = x3 – 2x2, which expression is equivalent to f(i)?

–2 + i
–2 – i
2 + i
2 – i

Pls , the question is in the picture!

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Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?