Chapter 5, Problem 76RE

Pollution. An environmental protection agency estimates that the rate of seepage of toxic chemicals from a waste dump (in gallons per year) is given by

     $R\left(t\right)=\frac{1,000}{{\left(1+t\right)}^2}$

where t is the time in years since the discovery of the seepage. Find the total amount of toxic chemicals that seep from the dump during the first 4 years of its discovery.