To calculate exponential growth use the formula y t a__ekt where a is the value at the start k is the rate of growth or decay t is time and y t is the populations value at time t. Formula to calculate exponential growth. P t P 0 e rt.
Decay exponentially at least for a while.
The variable b is percent change in decimal form. When finding the time t switch both sides and use the formula. The variable b is percent change in decimal form. K rate of growth when 0 or decay when.