To determine the missing dimension for the right rectangular prism, we need more information about the other dimensions or the volume of the prism. The options you've provided indicate that the width (w) could be one of the following values: 8 cm, 5 cm, 1.25 cm, or 0.8 cm.
If you have additional information, such as the length, height, or the volume of the prism, please provide that so we can identify the correct missing dimension.