The table below shows the cube roots of different numbers: Number
(x) 8 27 64 125
Cube root
(y) 2 3 4 5

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 bike for x hours is shown below:

f(x) = 15 + 20x

What is the value of f(80), and what does f(80) represent? (5 points)

(10 points)