(2+2i)(5+3i)
10+6i+10i+6i^2
10+16i+6(-1)
4+16i
When you have an “i^2”, you also have a negative one. The simplified answer is 4+16i
It’s 5 1/3 because 16 divided by 3 is 5 1/3
The expression (n+3) represents the measure of an exterior angle of a regular octadecagonal.