4. Determine whether the series 6. Determine whether the series n²+1 72³ 5. Determine whether the series (-1)" converges. Explain why. n=1 converges. Explain why. n! 72" converges. Explain why. 7.

Determine whether the series (-)" converges. Explain why. 8. Determine whether the series Σn converges. Explain why.