Alternating Series Error Bound Practice Test

Using $S_6$ for $\sum_{k=1}^{\infty}(-1)^{k}\frac{2}{k+1}$, what alternating-series error bound applies?

For $\sum_{k=1}^{\infty}(-1)^{k+1}\frac{1}{k^3}$, what is the maximum error when approximating the sum by $S_{10}$?