Which number line models the sum of 1+(−2) correctly?

I’m stuck on this i don’t understand.

What is not true about kl and mn? what is mn? (show your work)

Do some research and find a city that has experienced population growth. determine its population on january 1st of a certain year. write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a period of exponential growth. describe the variables and numbers that you used in your equation.