Step-by-step explanation:
2x+10=86+x
2x-x=86-10
x=76
I hope you understood :)
<span>A flat surface of a solid figure is called a "face".
Your answer is <em>face.
</em>
</span>
Check the picture below. Recall, is an open-top box, so, the top is not part of the surface area, of the 300 cm². Also, recall, the base is a square, thus, length = width = x.

so.. that'd be the V(x) for such box, now, where is the maximum point at?

now, let's check if it's a maximum point at 10, by doing a first-derivative test on it. Check the second picture below.
so, the volume will then be at
Usually bbc bitesize is what I use for basically everything. Here’s a link:
https://www.bbc.com/bitesize
Answer:
8√2
Step-by-step explanation:
18√2 - 2√50 = 18√2 - 2√(2*25)=18√2 - 2*5√2= 18√2 - 10√2= 8√2