Answer:

Step-by-step explanation:
From the question we are told that
Length 
Height 
Width 
Generally the equation for Volume of the Rectangular prism is mathematically given by



Therefore the number of half 1/2 inch cube X in v is


I'll sub my guy. Don't give up, keep climbing.
You have the following function:

Derivate implictly the previous expression, as follow:

Where you have used that:

Then, the implicit derivative of the given expression is:

Next, solve for y' as follow:

Answer:
20
Step-by-step explanation:
your welcome!!