The answer is choice D because if you combine the like terms, you get 15-23i
i hope that helps!!!!
The formula for Average speed = 
The car travels 80 km in 1 hour.
Then the car travels 90 km in 2 hours.
And finally the car travels 76 km in 1 hour
So the total distance covered by the car = 80 + 90 + 76 = 246 km
The total time taken to cover this distance = 1 + 2 + 1 = 4 hours.
So average speed = 
The average speed of the car is 61.5 km / h
I don't really get what you are asking for. Can you clarify it?
X cannot be 6 or -2/5 because if they were the denominator would be zero
Clara will she will have 16 phone calls while Toby will have 15