keeping in mind that any line parallel to MN will have the same exact slope as MN's.
![\bf (\stackrel{x_1}{2}~,~\stackrel{y_1}{6})\qquad (\stackrel{x_2}{4}~,~\stackrel{y_2}{0}) \\\\\\ slope = m\implies \cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{0-6}{4-2}\implies \cfrac{-6}{2}\implies \cfrac{-3}{1}\implies -3~~\checkmark \\\\[-0.35em] ~\dotfill](https://tex.z-dn.net/?f=%5Cbf%20%28%5Cstackrel%7Bx_1%7D%7B2%7D~%2C~%5Cstackrel%7By_1%7D%7B6%7D%29%5Cqquad%20%28%5Cstackrel%7Bx_2%7D%7B4%7D~%2C~%5Cstackrel%7By_2%7D%7B0%7D%29%20%5C%5C%5C%5C%5C%5C%20slope%20%3D%20m%5Cimplies%20%5Ccfrac%7B%5Cstackrel%7Brise%7D%7B%20y_2-%20y_1%7D%7D%7B%5Cstackrel%7Brun%7D%7B%20x_2-%20x_1%7D%7D%5Cimplies%20%5Ccfrac%7B0-6%7D%7B4-2%7D%5Cimplies%20%5Ccfrac%7B-6%7D%7B2%7D%5Cimplies%20%5Ccfrac%7B-3%7D%7B1%7D%5Cimplies%20-3~~%5Ccheckmark%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill)

Answer:
A
Step-by-step explanation:
Step 1, setting variables:
We already know the <em>exact</em> height of the prism: 6 feet. We can set the unknown width as variable <em>x</em>, and length as <em>x+2 </em>(<u>length is two feet more than width</u>).
Step 2, writing equations:
Great! We have everything now. Let us write the equation by<u> substituting our variables in</u>:

Ok! Let us <u>expand</u> the equation:
<u />
<u />

<em>I hope this helps! Let me know if you have any questions :)</em>
Given:
The function is:

To find:
The turning points.
Solution:
We have,

Differentiate the given function with respect to x.



For turning point,
.




Using zero product property, we get
and 
and 
Therefore, the turning points of the given function are at
and
.
The answer for your question is 30 ..