The volume of the rectangular pyramid with the given dimensions is: 1,890 cubic millimeters.
Volume of rectangular pyramid = 1/3(length × width × height)
Given the following:
Volume of the rectangular pyramid = 1/3(21 × 18 × 15)
Volume of rectangular pyramid = 1,890 cubic millimeters.
Learn more about volume of rectangular pyramid on:
https://brainly.com/question/924442
#SPJ4