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The answer is:
135 cubic feet.
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The total volume of the given stairwell made of solid concrete with the relevant parameters is; B: 135 cubic ft
What is the volume of the concrete?
The image gotten online shows that there are three staircase threads.
Now, we are told that for each thread, the dimensions are;
Length = 5 ft
Width = 3 ft
Height = 3 ft
Now, formula for volume of cuboid is;
V = L * W * H
Thus;
Volume of one step = 5 * 3 * 3
V_each step = 45 ft³
Now, there are three steps and as such;
Total volume = 45 * 3
Total Volume = 135 ft³
Read more about volume of concrete at; https://brainly.com/question/23421328
