(7) In this problem we will use Integral Test to estimate the sum S of the series by the n-th partial sum Sn-> ak. We define the remainder, Rn to be Rn-S-Sn- Theorem (Error Estimate for Integral Test) Suppose that f(k) = ak for k = 1, 2, f is continuous positive decreasing function and f (x) dx converges. Then, ak k=n+1 , where where ecreasingfunction andã(r)dr coivngsrkril f(x) dx