Fter days, the mass , in grams, of 100 grams of a certain radioactive element is given by the function () = 1000(0.97). To the nearest percent, what is the decay rate of the element? A. 3% B. 19% C. 21% D. 81%

Help plz

Abag contains 5 red marbles , 6 blue marbles and 4 green marbles. susie selects a marble and returns it to the bag before selecting another marble. if susie selects a red marble 6 out of 20 times, what is the experimental probability that the next marble she selects will be a red marble ?