1 is 39. J don’t know about 2 and 3 though:(
17. Yes!! SAS theorem
18. Yes !! SSS theorem
19. Yes !! SSS theorem
20. I don’t think so
The answer is 4 1/2 (four and a half).
e^x=170
because you subtract like terms (or add, it depends) then simplify (im bad at explaining)