The relationship between the number of hours a plumber works and the total work fee she charges is proportional. her fee for 555 hours of work is \$350$350dollar sign, 350.

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.