I need help on this question

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.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way