The length of FG is 10
To determine the length, we can see that the lengths EF and FG are equal in length.
Now, the expressions representing the lengths are;
EF = x + 7
FG = 2x + 4
The equation is given as;
EF = FG
Substitute the values
x + 7 = 2x + 4
collect the like terms
x - 2x = 4 - 7
subtract the values
-x = -3
x = 3
Then, the length of FG = 2x + 4 = 2(3) + 4 = 6 + 4 = 10