Respuesta :

Hello!
(Length x height x width) ÷ 3 = volume
  6 x 3 x 7 
   18 x 7
     126
 126 ÷ 3 = 42
The volume is 42 ft ³.
Hope this helped!
The formula for the volume of a pyramid is:

V=l×w×h/3
V=6×3×7/3
V=126/3
V=42

The volume of the pyramid is 42. So the answer is the second choice or B.