The table below shows the fourth roots of different numbers: Number (x) 16 16 81 81
Fourth root of the number (y) 2 −2 3 −3

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 boat for x hours is shown below:

f(x) = 32x + 75

What is the value of f(8) and what does f(8) represent? (5 points)