*This was the only problem I could figure out so I'm sorry*
C equals 101° b/c 1/2 a circle angle equals 180° which is the line. Angle F and Angle C are corresponding interior angles (same side angles) so if both of them together should equal 180. 180 - 79 (<F) = 101 (<C).
You do the same thing to find Angle E b/c it's corresponding interior angles to Angle D.
