The volume of the water at temperature $\"\"$ is $\"\"$ .

Domain of the volume function is $\"\"$ to $\"\"$ .

Differentiate the function $\"\"$ with respect to temperature $\"\"$ .

$\"\"$

Use the quadratic formula to find where the function is zero.

$\"\"$

$\"\"$ .

Here, $\"\"$ is with in the domain.

Hence maximum density occurs at this point.

Maximum density occurs at the temperature $\"\"$ C.