12. The mortality rate from heart attack can be modelled by the relation M = 88.9(0.9418)', where M is the number of deaths per 100000 people and r is the number of years since 1998. a) How many deaths from heart attacks occurred in this study in 1998? b) in 19981716 rate is 5.82% b = I r b: I 0.0582 b= 0. 9418 When will the mortality rate from heart attacks be half of what it was in 1998