<EFG and <GFH are a linear​ pair, m<EFGe=3n+21​, and m<GFH=2n+34. What are m<EFG and m<GFH?
I guess you mean EFGH is a straight line :
If so:
3 n + 21 + 2 n + 34 = 180
5 n + 55 = 180
5 n = 125
n = 25
then go back and get 3n+21 etc
If so:
3 n + 21 + 2 n + 34 = 180
5 n + 55 = 180
5 n = 125
n = 25
then go back and get 3n+21 etc