We continued our discussion of exponential growth and decay today. Alexa was able to write equations to represent them. F(x) = ab^x, where a is the initial amount, b is the amount of growth or decay, and x is amount of time. In cases of exponential growth, the variable b is equal to 1 + (Rate of increase). In cases of exponential decay, the variable b is equal to 1 - (rate of decrease).