The exponential function in its generic form is given by: y = A (b) ^ x Where, A: initial amount b: growth / decrease rate (b <1: decrease, b> 1: growth). We have the following function: y = 2 (4) ^ x We observed that: b = 4> 1 Therefore, the function is an example of exponential growth. We look for the intersection with the y axis. For this, we evaluate the function for x = 0: y = 2 (4) ^ 0 y = (2) * (1) y = 2 Answer: The function is an example of exponential growth.the y-intercept is: y = 2