Answer:
Domain is 0 to 50.
Step-by-step explanation:

1 coin is 4 ways
2 coins is 4*3 ways
3 coins is 4*3*2 ways
4 coins is 4*3*2*1 ways
so total is 4+12+24+24=64 sums
yes, I'm pretty shure they do
1/10 * 4/10 = 4/100 divide both by 4 it'll be 1/25
<span>There are no like terms.
If that's what your question is...
Not sure but hope I helped a bit.</span>