How do I do this math homework problem? (10 points for best answer!)?

I actually have no clue how to do this. Any help would greatly be appreciated. Thanks! 

Suppose we toss two fair dice. Let X = i+j, where i is the outcome of the first die, and j is the outcome of the second die, with i, j ∈ {1, 2, 3, 4, 5, 6}.  

Let p(x) = P(X=x) be the probability mass function of X. 

p(2) =   

p(3) =   

p(4) =   

p(5) =   

p(6) =   

p(7) =   

p(8) =   

p(9) =   

p(10) =   

p(11) =   

p(12) =