(1/3) to the power of 4

Which of these choices show a pair of equivalent expressions?

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.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)