Ascientist has 100 milligrams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation f(t)=100(1/2)^t/10. after three days, the scientist receives a second shipment of 100 milligrams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is f(t)=100(1/2)^t-3/10. after any time, t, the mass of the element remaining in shipment 1 is what percentage of the mass of the element remaining in shipment 2? a.78.1%b.81.2%c.123.1%d.128.0%