Can somebody me with this i don't get it you're too fast for me to answer and stuff then find the difference and write the simplest form i don't get it

What is the value of x? enter your answer in the box. photo attached.

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.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)