The figure below shows the rate, f(x) , in thousands of algae
per hour, at which a population of algae is growing, where x is in
hours.

*(Note that the graph passes through integer coordinate
points.)*

**(a)**

Estimate the average value of the rate over the interval

average value =

**(b)**

Estimate the total change in the population over the interval

total change =

You can earn partial credit on this problem.