We can simply add the expression to simplify the expression. So,
(7+3i)+(-8+9i) =7 +3i -8+9i Get rid of paranthesis.
=(7-8)+(3i+9i) Group the like terms.
= -1 + 12i
If it moves 4.5 times a year and each time it moves 10 meters, one one year it moves 45 meters. Now we want 11 years, so that's 45 times 11 which would give you 495 meters in 11 years
Yes they were, it had affected a lot of villages due to everything that was happening sadly