Answer:
12cm•6cm=72cm
72cm•5cm =
Step-by-step explanation:
360cm
The colume of a rectangular box (rectangular prism) is given by the next formula:

As you need to fidn the width, solve w in that formula:

Use the given measures and calculate the width:

Then, the width of the rectangular box is 16 centimeters
The only one that is not rational is the square root of 12.
The answer is D. H=68 :) Hope this helps