$\"\"$

\

The exponential growth function is $\"\"$ .

\

The half-life of radioactive potassium is $\"\"$ billion years.

\

Hence, time period is $\"\"$ and $\"\"$

\

The initial amount is $\"\"$ grams.

\

Substitue all the values.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Find the amount of potassium in $\"\"$ years.

\

$\"\"$ and $\"\"$ and $\"\"$

\

Susbtitute all the values in $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore, the amount of potassium left after $\"\"$ years is $\"\"$ grams.

\

$\"\"$

\

Find the amount of potassium in $\"\"$ years.

\

$\"\"$ and $\"\"$ and $\"\"$

\

Susbtitute all the values in $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore, the amount of potassium left after $\"\"$ years is $\"\"$ grams.

\

$\"\"$

\

The amount of potassium left after $\"\"$ years is $\"\"$ grams.

\

The amount of potassium left after $\"\"$ years is $\"\"$ grams.