500 g of a radioactive element is decaying exponentially. After 3 days 274 g of the element is left. a. Write a function in the form y = yo e " giving the number of grams of the element after t days. 274 f(t) b. Write the function from part a in the form y = yo 500 c. Use the answer from part a to find the half-life of the element. a. The exponential equation in the form y = ynek is (Round to three decimal places as needed.) 274 i(t) b. The function from part a in the form y = yo 500 IS (Round to three decimal places as needed.) c. The half-life of the element is days. (Round to one decimal place as needed.)