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Question:

A building has a number of floors of equal height, as well as a thirty-foot spire above them all. If the height of each floor in feet is h, and there are n floors in the building, which of the following represents the building’s total height in feet?

A nh+30
Explaination

If there are n floors, and each floor has a height of h feet, then to find the total height of the floors, we just multiply the number of floors by the height of each floor: nh. To find the total height of the building, we must also add the height of the spire, 30 feet. So, the building’s total height in feet is nh+30.