Idon't know how to do this i'm so confusing could someone me find these answers. my worksheet says that i can put that there is not enough information but i have to explain what information i would need to solve

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.

A+b= 17, ab=70, find the value of |a-b|

Build is 120 wide 20 feet high 48 feet long how many cubic feet and the volume