Please help 10 points

Answer:
FG = 15
Step-by-step explanation:
Note that
EF + FG = EG ← substitute values into equation, that is
6 + FG = 21 ( subtract 6 from both sides )
FG = 21 - 6 = 15
Answer:
15
Step-by-step explanation:
21-6 = 15.
the answer to the question