PLEASE HELP WILL MARK BRAINED

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

Just tell me how to set up the equation.

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?