just the circled ones:) thank you in advance!

In Exercises 17-28, use the Direct Comparison Test to determine whether the infinite series is convergent. clood vient andy to assert to istneo sal sic 17. 1 8-y. bill guols boxtay 0 13 all to azam to en=1 n2n 18. To sosido broosa's bas jo in ad n + 4n + 1 n=1 0O 19. 1 20. n=1 n 1/3 + 2n n=1 n3 + 2n - 1 OO