Which is the inverse of the function f(x) =4x

Sandy works at a clothing store. she makes $7 per hour plus earns 15% commission on her sales. she worked 75 hours over the last two weeks and had a total of $2,566 in sales before taxes. which of the following is closest to how much she will earn in hourly wages and commission for those two weeks?

Jorge wants to determine the enlarged dimensions of a digital photo to be used as wallpaper on his computer screen. the original photo was 800 pixels wide by 600 pixels high. the new photo will be 1,260 pixels wide. what will the new height be?

How is this equation completed? i cannot find any examples in the book.