Explanation:
2.
you skipped some important information that may have been written before problem 1.
if there is no autobahn information about the triangle, then this cannot be solved. we can draw infinitely many (and different) triangles with one leg being 10, and one part of the baseline being 6 (that by itself does not give us anything about the rest of the baseline).
the height from D to F has always a right angle. that is one of the main properties of a height and does not give us any information about the triangle itself.
now, we can solve this, if this is supposed to be an isoceles triangle (both legs are equally long, the height splits the baseline and the angle at D exactly in half).
then :
CF = FE = 6
ED = CD = 10
the height is then given by Pythagoras for e.g. the triangle DEF :
DE² = FE² + FD²
10² = 6² + height²
100 = 36 + height²
64 = height²
height = sqrt(64) = 8
the fact that this all gives us very nice numbers as solution is a strong indication that my assumption (isoceles triangle) was right.
3.
similarly to 2. I have to assume that WY is cutting the angle W in half.
it that is the case, then ZW = XW and we get
9x - 5 = 7x + 5
2x - 5 = 5
2x = 10
x = 5
ZW = 7×5 + 5 = 35 + 5 = 40
without that assumption this cannot be solved.
so, I hope I assumed correctly.
was this then enough explanation, or is something still unclear ?