A hospital has been tracking the number of incidents of heart disease it treats each year for several years. The data is shown below. Year Heart Disease Incidents 2012 76 2013 80 2014 84 2015 91 a) The data is approximately linear. Use the data from 2012 and 2015 to find an equation for the linear model. Use the variable t for years after 2010 (so 2015 would bet = 5), where n(t) is the number of heart disease incidents n(t) b) Using this model, predict the year in which the number of heart disease incidents will reach 121. The year