Practice!

Sample Problem

Is this the correct graph of e-0.63x?

Yes

No

If so, is it:

An exponential growth function

An exponential decay function

It is not the correct graph

Solution

e-0.63x

Plug in x= -2, e=2.718 to get e-0.63x =3.53;

Plug in x= 1, e=2.718 to get e-0.63x =0.53.

The points given on the graph correctly fit the equation. This is the correct graph.

Because r is negative, this is an exponential decay function.