This Is My Calculus 3 Homework Of Sequences And Series

Question

this is my calculus 3 homework of sequences and series

Extra credit
problems
# Find the sum of the series
6
n=1 ninth 20
3
# Does S 2n+1
n=1 ( n+ 1) 2
converges or diverges.
#
Given n+2 = an . Prove S any is decreasing ?Math