This exercise uses the radioactive delay model. The half-life of cesium-137 is 30 years. Suppose we have a 14-g sample. (a) Find a function m(t) = mo2/h that models the mass remaining after t years. m(t) = (b) Find a function m(t) = moet that models the mass remaining after t years. (Round your r value to four decimal pla m(t)= (c) How much of the sample will remain after 72 years? (Round your answer to one decimal place.) (d) After how many years will only 3 g of the sample remain? (Round your answer to the nearest whole number.)