#### Answer

15 minutes = 80 beats
lowest rate = -5 minutes or 5 minutes before
greastest change = between 0 minutes and 5 minutes

#### Work Step by Step

Look at the graph and determine the pulse rate 15 minutes after a cigarette is lit, when the pulse rate the lowest, and when the pulse rate show the greatest change.
a)Put your fringer at the 15min mark and drag it upwards until you reach the graph. Look over and determine the pulse rate
b)Look at the graph and see when it is the lowest
c) Look for a big jump in the graph where it is suddenly low then shoots up or when it is very high then shoots down