correct me if i'm wrong. ok but i think these are the answers you are looking for.
1. a. 2/6 or 1/3
b. 4/6 or 2/3
5. hhh, hht, hth, htt, thh, tht, tth, ttt
i'm not sure
answer: -11x + 6y-41
if you're figuring it just need to find what to add to get the numbers
to get a -6, you need to add -11 to 5
to get 6y, you just need to bring that and to remove 41, you need to subtract to itself to make it 0
so you have -11x +6y -41
For example, a pentagon (5 sides) has only 5 diagonals. Each vertex has two diagonals, so if you counted each diagonal from every vertex twice, you might think there were 10 diagonals.