The equation DY = -0.00012y gives the rate at which the amount, y, in milligrams, of a certain radioactive material changes over time, t, in years. If there are originally 10 milligrams of the radioactive material, which function models the amount of the radioactive material over time? O y= 10e-0.00012t O y= 10- 0.00012+ -0. 00012t O y= 10 1 2 0. 00012t O y= 10- 2