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The function P(t)=3.5(0.91)^t is exponential decay because the base of the exponential function, 0.91, is between 0 and 1. To find the percentage rate of change, we need to determine the percentage decrease per unit change in t.
The base of the exponent, 0.91, represents a decrease of 100% - 91% = 9%. Therefore, the percentage rate of change is 9%.
So the correct answer is:
C exponential decay; 9%