Raymond used 42 cubes to build the first layer of a rectangular prism. the edge length of each cube was 1 inch. the finished prism had a total of 7 layers. what is the volume of raymond’s prism in cubic inches?

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.