2/3 is the answer. Try not to overthink these answers because they’re usually quite simple in the end. :)
Answer:

Step-by-step explanation:
We are given that a function

We have to find the derivative of the function
Let 

Taking ln on both sides

By using 
Differentiate w.r.t x




Differentiate y w.r.t x

Using the value of du/dx

Answer:
one is for structure, two is for being able to move around, and three is to cover joints or sum like that
Step-by-step explanation: