Answer: 140 cubic inches
Step-by-step explanation:
The formula for determining the volume of a rectangular base pyramid is expressed as
Volume = 1/3 × base area × height
From the information given,
Length = 7 inches
Width = 3 inches
Base area = 7 × 3 = 21 square inches
Height = 12 - 4 = 8 inches
Volume = 1/3 × 21 × 8 = 56 cubic inches
The formula for determining the volume of a rectangular prism is expressed as
Volume = Length × width × height
Volume = 7 × 3 × 4 = 84 cubic inches
Volume of the composite figure is
56 + 84 = 140 cubic inches
