Alternating Series Error Bound Practice Test

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

For $\sum_{n=1}^{\infty}(-1)^{n}\frac{3}{\sqrt{n}}$, what is the maximum error when approximating with $50$ terms?