Figure 15.18
Pay-per-view
21 A person takes an automobile trip. The distance traveled d (in milos) is described as a
function of time t (in hours):
d=f(t) = 51′ + 12t where 0 stse
(a) What is the average speed during the first hour? Second hour?
(6) What is the average speed for the 4-hour trip?
Answer:
The formula for distance problems is: distance = rate × time or d = r × t.
Things to watch out for:
Step 2: Fill in the table with information given in the question.
Step 3: Fill in the values for d using the formula d = rt.
Step 4: Since the total distance is 210, we get the equation: