Final answer:
To find out how much lower the basement floor is than the roof of the building, you simply add the height of the roof above ground (45 feet) to the depth of the basement below ground (12 feet), resulting in a total difference of 57 feet.
Step-by-step explanation:
To determine how much lower the floor of the basement is than the roof of the building, we need to add the height of the building above ground to the depth of the basement below ground. The roof is 45 feet above ground, and the floor of the basement is 12 feet below ground.
Adding those two values gives us:
- Height above ground = 45 feet
- Depth below ground = 12 feet
- Total difference = Height above ground + Depth below ground
The total difference in height is:
45 feet + 12 feet = 57 feet
Therefore, the floor of the basement is 57 feet lower than the roof of the building.