The volume of the rectangular prism is
V = length x width x height
From the given figure
∵ The length = 8 units
∵ The width = 2 units
∵ The height = 5 units
Substitute them in the rule above
∴ V = 8 x 2 x 5
∴ V = 80 units^3
The volume of the prism is 80 units^3