Answer:
-i
Explanation:
Just divide that power by 4
99/4 you get 24.75
multiply the whole part 24 by 4
and then multiply 0.75 by 4
In the end, you get
[tex](i^{4})^{24}*i^{3}[/tex]
[tex]i^{4} = 1[/tex]
[tex]i^{3} = -i[/tex]
So, the answer is -i