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The amount of a radioactive isotope present at time t is given by A(t) = 700 e - 0.028941 grams, where t is the time in years that the isotope decays. The initial amount present is 700 grams. Complete parts (a) through (c). (a) How many grams remain after 15 years? g (Type an integer or decimal rounded to two decimal places as needed.) (b) Graph this function for Osts 100. Choose the correct graph below. O A. O B. O C. OD. 900- AA(t) AA(t) 900- 900- AA(t) AA(t) 900- O O O 100 100 100 100 (c) If the half-life is the time it takes for half of the initial amount to decay, use graphical methods to estimate the half-life of this isotope. Choose the correct answer below. ( A. about 8.95 vears ( B. about 43.95 vears Click to select your answer(s)