$\"\"$

Find how many grams of radioactive element will remain after $\"\"$ years.

A radioactive element decay $\"\"$ .

where $\"\"$ is the number of grams present initially and $\"\"$ is time in years.

Substitute $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$

Number of grams of radioactive element will remain after $\"\"$ years is $\"\"$ .

$\"\"$

Number of grams of radioactive element will remain after $\"\"$ years is $\"\"$ .