Answer:
11-3i
Step-by-step explanation:
6-7i+5+4i=6+5-7i+4i=11-3i
(-1i)+(9i)
in the brackets you minus 7 from 6 which takes it to -1i.
Next you add 5 and 4i to get to 9i.
Its 3
what?
...............
