Hi everyone, I have exam on thursday and I can't understand some question about comression and tension members .Is there anyone help me?

http://s4.dosya.tc/server2/h3r1r4/P...1.pdf.html (tension)

http://s4.dosya.tc/server2/vlx8mq/problem_set_2.pdf.html (compression)

http://s4.dosya.tc/server2/gwb1it/Problem_set_3.pdf.html

mail:vathan1234@gmail.com