is the equation A=27500(0.73)^t a model of exponential growth or exponential decay, and what is the rate of change per time period?

This equation A=27500(0.73)^t is a model of exponential decay because the base of the exponential term (0.73) is between 0 and 1.

The rate of change per time period can be calculated by taking the derivative of the equation with respect to t. The derivative of A=27500(0.73)^t is:

dA/dt = 27500 * ln(0.73) * (0.73)^t

This derivative represents the rate of change of A with respect to time t.