The period for the following function y=2cos(2/3)x -6 is... HELP PLEASE ITS NOT HARD I JUST DONT GET IT!!!

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min