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Answer:
2 autos per hour
f(h) = 2h
Explanation:
The graph in the interval 0 ≤ h ≤ 4 is a straight line through the origin, so represents a proportion. The constant of proportionality is the slope of the line, which is the ratio of vertical change to horizontal change.
On the interval [0, 4], we see that 8 automobiles are completed in 4 hours, so the slope is ...
(8 autos)/(4 hours) = 2 autos/hour
Then the completion rate function in that interval is ...
f(h) = 2h