DDT is a toxic agricultural chemical that was used in the United States before it was banned in 1972. DDT has a half-life of 15 years. That means that it takes 15 years for one half of a quantity of DDT to degrade into a different, harmless chemical. Suppose an environmental scientist in 2015 measured 9 grams of DDT in a soil sample taken from land where DDT was once heavily used. The scientist modeled the amount of DDT in the soil, ​d​, with the function d(t) = 9(0.5)t . She indicated in her notes that t represented the number of half-lifes since 2015. *​Remember a half-life is 15 years. Part A) Find d(0) . What might this value represent in this context? Part B) Find d(1) and d(2) . What might these values represent in this context?