Answer :
a) H(x) = 220 - x
b) H(45) = 220 - 45 = 175
c) the slope is the amount the max heart rate goes down per year
d) 168 = 220 - x
x = 220 - 168 = 52 years old
b) H(45) = 220 - 45 = 175
c) the slope is the amount the max heart rate goes down per year
d) 168 = 220 - x
x = 220 - 168 = 52 years old