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Mathematics 15 Online
OpenStudy (anonymous):

What kind of number is 5i? A.integer B. Rational C. complex D. irrational

OpenStudy (cwrw238):

i stands for sqrt(-1)

OpenStudy (anonymous):

i is an imaginary number, which means 5i is a complex number. Remember complex numbers are in the form "a + bi" so they have an imaginary part.

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