A contractor is building a set of stairs out of concrete. Each stair is exactly the same length, width, and height. H=1.8 W=1.2 L=2.4
(a) Which solid figures can the stairs be broken into? What are the dimensions of each solid figure?
(b) How much concrete will be needed to form the stairs?

Given:
height = 1.8
length = 2.4
width = 1.2

The solid figure that the stairs can be broken into is RECTANGULAR PRISM.
Its dimension would be 2.4 by 1.2 by 1.8

We need to get the volume of 1 solid rectangular prism.
Volume = length * width * height
V = 2.4 * 1.2 * 1.8
V = 5.184 cubic units

Let us assume that the unit measure used is feet.
It is said that the weight of concrete is approximately 150 pounds per cubic foot.
To get the total weight of the concrete, multiply volume by 150 pounds per cubic foot.

5.184 cubic feet * 150 pounds/cubic ft = 5.184  * 150 pounds = 777.60 pounds