[tex]\begin{gathered} 1.Rate\text{ of increase in heart rate is,} \\ \text{Rate}=\frac{100-80}{10-5} \\ \text{Rate}=4\text{ (increase rate)} \\ 2.Heart\text{ rate is constant for the }15\text{ to 35 minute.} \\ 3.\text{ Heart rate decreases for the 35 to 45 minute} \end{gathered}[/tex]
