1. The problem statement, all variables and given/known data Is this correct? The sum of the forces in the Y have to be zero and there is only two y-components so it's pretty simple to determine this. There are also only two x-components so those will also cancel each other out as they have to go in opposite directions to balance as it is in static equilibrium = 0 I don't know what to do from here. If the diagonal '?' is tension because it has to balance the compression in the y direction then what would the diagonal force be in the horizontal '?'. I don't know how to balance this because of the 5th member being there. Since 2 is compressing in the horizontal then 7 has to compressing too but after I've founds this, how would I know what 5 is? This one has really got me troubled. 5 is what I believe a zero force member. 2. Relevant equations ΣFx=0, ΣFy=0, this is meant to be a qualitative question but even when I do it quantitatively I cannot figure some out. 3. The attempt at a solution Pointing to the joint is compression, pointing away from the join is tension.