Using the volume of a rectangular prism, it is found that Marcus shipped 2040 in³ of the boxes.
The volume of a rectangular prism of lenght l, width w and height h is given by:
V = lwh.
Prism 1 has dimensions of h = 10, l = 20, w = 7, hence it's volume in cubic inches is given by:
V1 = 20 x 10 x 7 = 1400 in³.
Prism 2 has dimensions of h = 4, l = 20, w = 4, hence it's volume in cubic inches is given by:
V2 = 20 x 4 x 4 = 320 in³.
Marcus shipped 1 of the larger boxes and 2 of the smaller boxes, hence the total volume is of:
V = V1 + 2V2 = 1400 + 2 x 320 = 2040 in³.
More can be learned about the volume of a rectangular prism at https://brainly.com/question/17223528