Final answer:
To graph the piecewise linear function, plot a straight horizontal line at y = 10 for the interval 0 ≤ x ≤ 20. The value of f(1) is 10.
Step-by-step explanation:
To graph the piecewise linear function f(x), we need to plot the function for different intervals. In this case, the function is a horizontal line with a constant value of 10 for the interval 0 ≤ x ≤ 20. So, the graph will be a straight horizontal line at y = 10 between x = 0 and x = 20. To find the value of f(1), we need to find the corresponding y-value on the graph at x = 1. Since the function is a horizontal line, the y-value will be the same for all x-values in the interval 0 ≤ x ≤ 20, which is 10. Therefore, f(1) = 10.