$\"\"$

$\"\"$ is rate of growth of child in pounds per year.

The integral is $\"\"$ .

Net change theorem: $\"\"$ .

$\"\"$ .

$\"\"$ represents the net change in childs $\"\"$ weight between age $\"\"$ and age $\"\"$ .

$\"\"$

$\"\"$ represents the net change in childs $\"\"$ weight between age $\"\"$ and age $\"\"$ .