Answer:
600 ft³
Step-by-step explanation:
Base area: B
Base is triangle
base = 12 ft and height = 5 ft
Area of triangle = B = 

H = 20 ft
Volume = B * H
= 30 * 20
= 600 ft³
Answer C
Step-by-step explanation: lol idk
The vertex would be the point on the right angle like the tip of the right angle
The answer could be
-1287
im not sure