**Problem : **
Express
using the imaginary unit
ı
.

**Problem : **
Is
3
a complex number?

**Problem : **
Rewrite the complex number
+3ı^{4}
in standard form
*z* = *a* + *b*ı
and find
*a*
and
*b*
.

**Problem : **
What is
ı^{618}
?

**Problem : **
When the complex number
*z* = - 2 + 3ı
is plotted in the complex plane,
in which quadrant is it?