17% of what is 156 i don't understand how i get this and it is due tomorrow but the part i don't get is the which number goes where

What is the common difference in the following arithmetic sequence 7,3,-1,-5

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

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.