# A new born child grows at a rate of #4/sqrtt# pounds per month for the first 12 months (#t>0#). How many pounds does the child gain between the 1st and 4th month?

##### 1 Answer

Dec 1, 2017

The net change is the integral of the rate of change.

#### Explanation:

# = 8[sqrtt]_1^4#

# = 8[2-1] = 8# #lbs#