The table below shows the outputs y for different inputs x: input (x) 1 1 3 3 output (y) 4 2 12 6 part a: does the table represent y as a function of x? justify your answer. (5 points) part b: the total cost f(x), in dollars, for renting a paddleboat for x hours is shown below: f(x) = 20 10x what is the value of f(120), and what does f(120) represent? (5 points