Question

Please just help me find p or r this is the only thing I can't do on this problem!
For the series below, us the limit comparison test by calculating the limit of an/fn wher fn is either 1/n^P for some p or r^n for some r. Give the value for p or r.
sum from n=1 to infinity of (5n+8)^0.5/(3n^2+n+3)