Question

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

y=4(9)^x

Answer 1

Growth, 800%

Explanation:

9 > 1

So growth

9(4¹) = 36

(36-4)/4 × 100

= 800%

Answer 2

growth 800%

Explanation:

y=4(9)^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 growth

To find the percent growth take b-1

9-1 = 8

Change to a percent

800%