A radioactive isotope that was originally 275 grams has decayed to 150 grams. the equation shown can be used to calculate the number of years/T, it took for the decay to occur
150 + 275e ^-0.1386t
what is the approximate number of years it took for the isotope to decay for 275 grams to 150 grams?
A.0.1 years
B.0.4 years
C.1.9 years
D.3.9 years
E.4.4 years