#7 1 & 2, 3&4, 5&6, 7&8.
#8 1&4, 3&2, 5&8, 7&6. (choose two pairs)
#9 Alternate interior angles.
#10 Interior angles, I believe.
#11 30 degrees
#12 150 degrees
#13 110 degrees
#14 60 degrees
#15 x = 26; BGH = 78 degrees
#16 x = 26; GHD = 102 degrees
Hope that helps!
