How do i find the surface area of a a triangular prisim

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.

Can someone explain to me how to do

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?