Please just answer correctly

What is the inverse of the function f(x) = 2x + 1?

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

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15