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 truck for x hours is shown below: f(x) = 25x + 16 What is the value of f(20) and what does f(20) represent?

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