Ineed with number 2 and 3 i can't get this wrong and explain

Because on number two there is a right angle and a part of it is 66 you subtract 66 from 90 and then divide that by 31 and subtract 7. Hope that helped a little 

2.) If the degree you are looking for is the angel, the answer would be 24. 
     31x-7+66=90
     31x+59=90
           -59  -59
     31x=31 (divide that by each other)
     and get 1.  Plug in 1 to x and you get 24. 66+24 = 90

3.) 65x-12=43x+10 (Set them equal to each other since they will be the same measurement because of vertical angels)
    65x-12=43x+10
   -43x      -43x
    22x-12=10
         +12  +12
    22x=22 (divide and you get 1) 
    Plug those in and you get 35 degrees for your answer to number 3 :)

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.