Exponential Decay Functions Answers

Which function represents exponential decay?f(x) = (2)xf(x) = ()xf(x) = 3()xf(x) = 2()x

A doctor estimates that a particular patient is losing bone density at a rate of 3% annually. The patient currently has a bone density of 1,500 kg/mg3. The doctor writes an exponential function to represent the situation. Which values should the doctor use for a and b in a function written in the form f(x) = abx, where f(x) represents the bone density after x years?

b = [___]