Answer:
The volume is 1449 ft^3
Explanation:
Split each section, the living room and hallway, into two different rectangular prisms to solve for.
The larger rectangle will have a length of 15ft, a width of 12ft, and a height of 7ft as shown in the diagram. Multiply length, width, and height to find the volume of 1,260ft.
15*12*7=1,260
The smaller rectangle will have a length of 9ft. That's found by subtracting 15 from 24. The width will be 3ft. That's found from subtracting 9 from 12. The height is still 7. Multiple each together to find the second rectangle's volume of 189ft.
24-15=9
12-9=3
9*3*7=189
Add both volumes together and you have the volume of the whole space.
1,260+189=1449ft^3