Answer:

Step-by-step explanation:
Given
See attachment for diagram
Required
The equation to find x
First, calculate the area of the big rectangle using:

So:

The smaller rectangle

The difference between this areas give the area of the shaded region.
So:


Open brackets

Collect like terms


<em>The above equation can be used to solve for x</em>
The derivative of x^3 is 3x^2.... is that what you were looking for?
Answer:
- Rectangular Prism
- Cube
- Cylinder
Step-by-step explanation:
I know because I just did it on an assignement and it said these were the right answers.