The post office is now calculating the volume of packages to determine the shipping cost. if a box measure 8 1/2 inches long, 5 1/4 inches wide, and 7 inches high, what is its volume?

volume of box = 312.375 in²

Explanation:
The volume of a rectangular box can be measured as follows:
volume = length* width * height

From the givens we have:
length = 8.5 in
width = 5.25 in
height = 7 in

Substitute with the givens in the above equation to get the volume as follows:
volume = length * width * height
volume = 8.5 * 5.25 * 7
volume = 312.375 in²

Hope this helps :)