6. [-/4 Points] DETAILS 0/6 Submissions Used This exercise uses the radioactive decay model. The half-life of cesium-137 is 30 years. Suppose we have a 14-g sample. (a) Find a function m(t) = m 27/h that models the mass remaining after t years. m(t) : (b) Find a function m(t) = me "that models the mass remaining after t years. (Round your r value to four decimal places.) m(t) = (c) How much of the sample will remain after 68 years? (Round your answer to one decimal place.) 9 (d) After how many years will only 3 g of the sample remain? (Round your answer to the nearest whole number.) yr Need Help? Read It