The function f(x) = 735(1/2)ˣ models the number of grams in a sample of a radioactive substance after x years. Which statements are true about the sample?
a. The sample is growing.
b. The sample is decaying.
c. The sample grows to 5,880 after 3 years.
d. The initial amount of the sample is 735 grams.
e. The sample decays to 91.875 grams after 3 years.