substitution or integration by parts

For each of the following integrals, determine whether integration by substitution or integration by parts is more appropriate. Do not evaluate the integrals.

I think i have them right....

i just want to make sure, pointers on seeing which is better to use would be very much appreciated!

(a) http://www.webassign.net/www14/symIm...3cca38f8bb.gif by parts

(b) http://www.webassign.net/www14/symIm...e51ef3555a.gif by parts

(c) http://www.webassign.net/www14/symIm...dcda80ee2a.gif substitution

(d) http://www.webassign.net/www14/symIm...a0989963a2.gif substitution

(e) http://www.webassign.net/www14/symIm...10e46fb3b6.gif substitution

(f) http://www.webassign.net/www14/symIm...cb349e2a53.gif by parts

(g) http://www.webassign.net/www14/symIm...759a442a1a.gif by parts