Answer:
11
Step-by-step explanation:
GH = 9
FH=FG+GH
21= 12+GH
GH = 21-12 =9
I hope I helped you^_^
First break up 72 into
36 x 2 x -1
Then take the square root of 36
6 square root 2 x -1
Finally make square root -1 = i
6i square root 2 is your answer
