Step-by-step explanation:
Since the formula of a rectangular prism is when we multiply length times width times height, or 10.4 * 5* 8.
5*8 = 40, and 10.4*40 = 416. (0.4*40 = 16 and 10*40 is 400, so you add them up)
That means that you answer is 416 Millimeters
