According to the given graph, the function is labor in hours related to units produced.
Based on the graph, f(5) = 8 since that's the value assigned to x = 5.
Therefore, the answer to the first question is C. 8.
On the other hand, f(x) = 8 asks about the number of labor hours for 8 units produced.
According to the graph, f(5) = 8 which means the labor hours are 5.
Therefore, the answer to the second question is B.