The mass M (in grams) of a radioactive sample is reduced to 75 % of its initial mass after 4 years.Assume M satisfies the differential equation dMdt = kM, where t is measured in years. If the massis initially 10 g, find the mass (in grams) that would remain after 9 years. Round your answer to1 decimal place.

The mass M (in grams) of a radioactive sample is reduced to 75 % of its initial mass after 4 years. Assume M satisfies the differential equation & = dM = kM, where t is measured in years. If the mass is initially 10 g, find the mass (in grams) that would remain after 9 years. Round your answer to 1 decimal place. A. 8.2 B. 6.3 C. 4.9 D. 7.1 E. 3.4 F. 2.6 G. 5.2