Having a hard time determining which is which
okay i'll try to help you.
scalene is defined as 3 different side lengths, correct?
hence no two side lengths are the same. are there any triangles in the diagram which do not show two side lengths equal?
yes a couple
which ones are they? these are hence the scalenes.
good. there is actually one more. it looks like it is isosceles but it is actually scalene.
is that correct?