How maximal heart rate depends on age. They found that if age x is given in years, then the maximum heart rate of a healthy adult can be predicted by the following formula: h(x)=208−0.7x. Explain in words what dh/dx represents.
a) Rate of change of maximum heart rate with respect to age
b) Slope of the function h(x)
c) Concavity of the graph
d) None of the above