I got 366 as the answer but my school won’t accept that answer so someone please help me!!!

Answer:
V = 381 in³
Step-by-step explanation:
The figure is composed of a rectangular prism and a triangular prism.
The volume (V) of the complete figure is
V = volume of rectangular prism + volume of triangular prism
= (16 × 7 × 3 ) + ( [tex]\frac{1}{2}[/tex] × 3 × 5 × 6 )
= 336 + 45
= 381 in³