Final answer:
The decay rate of the function y = 400(0.32)^6 is 0.32, indicating that the function is describing exponential decay, with option A) being the correct answer.
Step-by-step explanation:
The growth or decay rate of an exponential function like y = 400(0.32)^6 can be determined by looking at the base of the exponent. In this function, the base is 0.32, which is less than 1. This indicates that the function is describing exponential decay, rather than growth. Therefore, the decay rate for the function y = 400(0.32)^6 is 0.32, making option A) the correct answer. The number 6 in the exponent indicates how many times the base is being multiplied by itself, and the 400 is the initial amount before any decay has occurred. Neither of these is related to the rate of decay.