Answer:
The volume of the pyramid is 
Step-by-step explanation:
we know that
The volume of the triangular pyramid is equal to

where
B is the area of the triangular base
H is the height of the pyramid
step 1
Find the area of the base B

we have


substitute

step 2
Find the volume
we have


substitute


-24 - I didn’t explain it in words, but the step by step is in the image!
-6 7/8 /(-3 3/4)
55/8X4/15
11/6
1 5/6