Question

What is critical temperature??
______________
Was my answer right???
It's explanation was very complicated.
And I used trial and error method.
:)
It's a childish method but very effective.​

Answer 1

Answer:

Critical temperature (of a substance) can be defined as the highest possible temperature value at which the substance can exist as a liquid. 

Answer 2

See the attachment

method is differentiation..

and yes your answer is correct..

x = 10 ( 20 - x )

= 20 - 10 = 10