I need help on these questions.

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.

How can constraints be used to model a real-world situation?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)