The best way to figure out whether our rate of change is increasing or decreasing is to look at the acceleration because acceleration is really just the rate of change of velocity. Then we can think a little bit about this velocity versus speed question. What is the acceleration at time 5.5? Get the calculator out. We can use calculators for this part of the AP exam. I assume they intend us to because this isn't something that's easy to calculate by hand. The acceleration at time 5.5, we just have to say t is 5.5 and evaluate this function.