Answer:
10. Option 1
11. Option 3
Explanation:
Given the dimensions of rectangular prism. we have to calculate the volume of prism.
Length, l=12 inches
Width, w=8 inches
Height, h=4 inches

Option 1 is correct.
Given the dimensions of triangular prism. we have to calculate the volume of prism.
Length, H=18 ft
Base, b=12 ft
Height, h=2 ft

Option 3 is correct.