What is f(4) for the function f(x)=5x 9?

What is the solution to the equation 9^(x+1) =27

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

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.