The table below shows the fourth powers of different numbers: Number (x) 1 −1 3 −3 Fourth power of the number (y) 1 1 81 81 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 townhouse for x months is shown below: f(x) = 875x + 750 What is the value of f(12) and what does f(12) represent? (5 points)