shorten this:

The first layer of the rectangular prism consists of 42 cubes. Since each cube has an edge length of 1 inch, the volume of each cube is 1 cubic inch.
Thus, the volume of the first layer is 42 cubic inches.

Since there are 7 layers in total, the volume of the entire prism can be calculated by multiplying the volume of the first layer by the number of layers:

42 cubic inches * 7 layers = 294 cubic inches

Therefore, the volume of Raymond's prism is 294 cubic inches.

The rectangular prism is made up of 42 cubes on the first layer with a volume of 1 cubic inch each. This means the first layer has a total volume of 42 cubic inches. With 7 layers in total, the volume of the entire prism is 294 cubic inches.