Determine whether the function is growth or decay AND its percentage of growth or decay.

y=7 (.4) ^x

decay 60%

Step-by-step explanation:

y=7 (.4) ^x

The equation is of the form

y = a b^x

b tells us growth or decay

b>1 growth

b<1 decay

This is decay

To find the percent decay take 1-b

1-.4 =.6

Change this to percent

60%

Decay, 60%

Step-by-step explanation:

Decay because 0.4 < 1

7 (.4) ¹ = 2.8

%: 2.8/7 * 100 = 40%

Decrease of 60%