(d) Find a linear regression model for the (t, In a) pairs. y = 7.1701 + ( -0.3466 )x (Round to four decimal places as needed.) (e) Rewrite the linear regression in terms of t and a. In a = 7.1701 + ( -0.3466 )t (Round to four decimal places as needed.) (f) Use your regression equation in terms of t and a to make a prediction about the amount of medication left in the body after 18 hours, assuming no additional medicine is taken. The amount of medication left in the body after 18 hours will be Img al places as needed.)