15) Plot the graph of the function.

Solution:

The graph shows a step function. For x values from 0 to 2 (exclusive of 2), y=1. For x values from 2 to 4 (exclusive of 4), y=3. For x values from 4 to 6 (exclusive of 6), y=5. For x=6, y=6.

Answer: The graph of the function is shown above.