Graph each function and tell whether it represents exponential growth, exponential decay, or neither. y=80(0.25)^{x}

Determine whether each function is an example of exponential growth or decay. Then, find the y-intercept. $y=25/7(7/5{)}^x$

There was a sample of

300

milligrams of a radioactive substance to start a study. Since then, the sample has decayed by

2.3%

each year.

Let

t

be the number of years since the start of the study. Let

y

be the mass of the sample in milligrams.

Write an exponential function showing the relationship between

y

and

t

.

For the following exercises, determine whether the equation represents exponential growth, exponential decay, or neither. Explain. $y=220(1.06{)}^x$

Determine whether each function is an example of exponential growth or decay. Then find the y-intercept. $y=3e^x$