Y a 1 b x. You will notice that in these new growth and decay functions the b value growth factor has been replaced either by 1 r or by 1 - r. So we have a generally useful formula.
P t P 0 e k t.
The general rule of thumb is that the exponential growth formula. Exponential growth can be modeled using the following function. P tP_0e kt P t P. Its an equation that has exponents that are v a r i a b l e s.