Given the following exponential function, identify whether the change represents

growth or decay, and determine the percentage rate of increase or decrease.

y=9300 (0.991)

I'm assuming the function given is y = 9300 (0.991) ^x

If so, then the base of the exponent 0.991 is in the form 1+r

1+r = 0.991

r = 0.991-1

r = - 0.009

The negative r value indicates a percent decrease.

Specifically it is a 0.9% decrease since 0.009 = 0.9/100 = 0.9%

Any time you have a percent decrease like this, the exponential function is undergoing decay.