1.1) The missing values in the table can be completed as in the image I provided.
1.2) The input values are the values of the independent variable, which in this case is the number of cars (X).
1.3) The output values are the values of the dependent variable, which in this case is the number of wheels (Y).
1.4) The two variables represented in the table are the number of cars (X) and the number of wheels (Y).
1.5) The independent variable is the number of cars (X). This is because the number of wheels on a car is determined by the number of cars, not the other way around.
1.6) The dependent variable is the number of wheels (Y). This is because the number of wheels depends on the number of cars.
1.7) A verbal statement that relates the number of cars to the number of wheels in general could be: "The total number of wheels is equal to four times the number of cars."
1.8) A number sentence that relates the number of cars to the number of wheels in general could be: Y = 4X