An exponential function is of the general form f(t) = a*b^t

Here a = f(0) and b is a constant.

If b lies between 0 and 1, it is an exponential decay function.

On the other hand if b is greater than 1, it is an exponential growth function.

For example f(t) = 100*(1/2)^t would decrease for increasing values of t as b lies between 0 and 1. f(t) = 100*2^t would increase for increasing values of t, this is a exponential growth function.

**For any exponential function f(x) = a*b^x, if b is less than 1 and greater than 0 it is a decay function and if b is greater than 1 it is a growth function. **

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