The simplest form of the fraction is 9/25
4-9i÷-6i times both sides by 6i
6i(4-9i)÷6i(6i)
24i-54i²÷-36i²
24i-54(-1)÷-36(-1)
54+24i÷36 now reduce
9+4i÷6
I hope this helps!!
Answer: The answer should be B
If you find a first you will be able to find b a little faster then it is super easy after that you got this!