What the. That ain’t a real question
1. Angle DEF
2. Definition of congruent angles
3. The measure of angle GHI
Answer:
The volume is 
Step-by-step explanation:
we know that
The volume of a triangular prism is

where
B is the area of the triangular base
L is the length of the prism
we have

----> perpendicular distance between the two triangular bases
substitute

4x + 9 = 68
Subtract 9 from both sides:
4x = 59
Divide both sides by 4
X = 59/4
X = 14.75