Answer:
The approximate volume of a stack of 40 nickels is 25132.741 cubic milimeters.
Step-by-step explanation:
A nickel can be modelled by the formula of a right cylinder, the approximate volume of the stack of nickels ( ), measured in cubic milimeters, is the product of the number of elements (
), measured in cubic milimeters, is the product of the number of elements ( ), no unit, and the volume of each element (
), no unit, and the volume of each element ( ), measured in cubic milimeters. That is:
), measured in cubic milimeters. That is:
 (1)
 (1)
By volume equation of right cylinder, we have the following formula:
 (2)
 (2)
Where:
 - Amount of nickels, no unit.
 - Amount of nickels, no unit.
 - Diameter of nickel, measured in milimeters.
 - Diameter of nickel, measured in milimeters.
 - Thickness of nickel, measured in milimeters.
 - Thickness of nickel, measured in milimeters. 
If we know that  ,
,  and
 and  , then the net volume of the stack of nickels is:
, then the net volume of the stack of nickels is:


The approximate volume of a stack of 40 nickels is 25132.741 cubic milimeters.