Question

Given the following exponential function, identify whether the change represents growth or decay, and determine the percentage rate of increase or decrease.
y, equals, 770, left parenthesis, 0, point, 9, 1, 1, right parenthesis, to the power x
y=770(0.911)
x

Answer 1

Because the base 0.911 is less than 1, the function represents exponential decay.
The percent decrease per 1 unit in x is (1 − 0.911) × 100% = 8.9% (about an 8.9% decrease each x).