The radioisotope phosphorus-32 is used in leukemia therapy. the half-life of this isotope is 14.26 days. which equation determines the percent of an initial amount of the isotope remaining after t days? a) a = 100 (1/2) ^ 14.26 / t b) a = 14.26 (1/2) ^ 100 / t c) a = 100 (1/2) ^ t / 14.26 d) a = 14.26 (1/2) ^ t / 100