Plz help me its confusing

What is the output, or dependent variable of quantity? 1: x 2: f(x) 3: y

Ashley spent half of her lunch money on a turkey sandwich. then she spent two-thirds of the money she had left on a bottle of juice and the rest of the money on a cookie. if the cookie cost $.75, how much lunch money did ashley have to start with?

If the class creates a histogram of the data in table, how many students are in the range 12cm to 13.9 cm