MCQM5563 · [1] A radioactive sample has mass M(t)=250× 0.94^ t grams, where t is in years. The mass first falls below 80 grams after T years. Which equation is solved on a calculator to find T ? A250× 0.94^ T=250-80B80× 0.94^ T=250C250× 0.06^ T=80D250× 0.94^ T=80 Next question →