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

I have no idea how to do this! I know it is very easy, but it's probably the notation that is confusing me! An explanation of how to do at least the first couple would be helpful!

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. Round all answers to 4 decimal places.

p(2) =  

p(3) =  

p(4) =  

p(5) =  

p(6) =  

p(7) =  

p(8) =  

p(9) =  

p(10) =  

p(11) =  

p(12) =