ewaddell25 ewaddell25 01-11-2017 Mathematics contestada You have 900-grams of an an unknown radioactive substance that has been determined to decay according to D(t)=900e−0.002415⋅t where t is in years. How long before half of the initial amount has decayed? It will take ____ years for half of the initial amount to decay. (Round to 1 decimal place)