Which is a exponential function

Answer:
An exponential function is a mathematical function used to find exponential decay or growth, compute investments, model populations, and so on. It is a function with the form f(x) = abx, where a is a non-zero real number called the initial value and b is any positive real number such that b ≠ 12.
Step-by-step explanation:
An example of an exponential function is the function f(x) = 2^x