hello everyonee!

i need help on these questions please.

1) determine wether each of the followin series is convergent:

a) 2/2^2 + 2^2/2^2 + 2^3/3^2 + ... 2^n/n^2

b) Un = 1+2n^2/1+n^2

2)

does this series in picture converge (sorry did not know how to write in text)