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Answer:
3+3i
Step-by-step explanation:
The mid point formula in a complex plane is for points a+bi and s+ti is
[tex]Midpoint = \frac{a+s}{2} +\frac{(b+t)i}{2} \\[/tex]
For points 1 + 9i and 5 — 3i
[tex]Midpoint = \frac{1+5}{2} + \frac{(9-3)i}{2}[/tex]
[tex]Midpoint = \frac{6}{2} + \frac{6i}{2}[/tex]
Midpoint = 3 + 3i