The value of 
is -3. 
<h2>Procedure - Differentiability</h2><h3 /><h3>Chain rule and derivatives</h3><h3 />
We derive an expression for by means of chain rule and differentiation rule for a product of functions:
![\frac{d}{dx}[f(x)\cdot g(y)] = [f'(x)\cdot \frac{dx}{dx}]\cdot g(y) + f(x) \cdot [g'(y)\cdot \frac{dy}{dx} ]](https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdx%7D%5Bf%28x%29%5Ccdot%20g%28y%29%5D%20%3D%20%5Bf%27%28x%29%5Ccdot%20%5Cfrac%7Bdx%7D%7Bdx%7D%5D%5Ccdot%20g%28y%29%20%2B%20f%28x%29%20%5Ccdot%20%5Bg%27%28y%29%5Ccdot%20%5Cfrac%7Bdy%7D%7Bdx%7D%20%5D)
![\frac{d}{dx}[f(x)\cdot g(y)] = f'(x)\cdot g(y) +f(x)\cdot g'(y)\cdot \frac{dy}{dx}](https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdx%7D%5Bf%28x%29%5Ccdot%20g%28y%29%5D%20%3D%20f%27%28x%29%5Ccdot%20g%28y%29%20%2Bf%28x%29%5Ccdot%20g%27%28y%29%5Ccdot%20%5Cfrac%7Bdy%7D%7Bdx%7D)
(1)
If we know that 
, 
,<em> </em>
,<em> </em>
and
, then we have the following expression:
The value of is -3.
To learn more on differentiability, we kindly invite to check this verified question: brainly.com/question/24062595
<h3>Remark</h3>
The statement is incomplete and full of mistakes. Complete and corrected form is presented below:
<em>The point (-2, 4) lies on the curve in the xy-plane given by the equation </em>
<em>, where </em>
<em> is a differentiable function of </em>
<em> and </em>
<em> is a differentiable function of </em>
<em>. Selected values of </em><em>, </em>
<em>, </em><em> and </em>
<em> are given below: </em><em>, </em><em>, </em><em>, </em><em>. </em>
<em />
<em>What is the value of </em><em> at the point </em>
<em>?</em>
Based on the excerpt, President Jimmy Carter made reference to the meeting he had with various leaders on the energy crisis.
<h3>What is a state crisis?</h3>
A state crisis can be defined as any form of event that has the potential of causing an unstable and dangerous situation across a country, thereby, adversely affecting the people that are living within it.
In this scenario, the United States of America had an energy crisis while Jimmy Carter was the president. Thus, President Jimmy Carter gave a speech on the 15th of July, 1979 to address the citizens of the United States of America on their energy crisis through a live TV broadcast.
Read more on Jimmy Carter here: brainly.com/question/23775670
One of the examples from the text that can be regarded as clear, logical and sincere is:
- The speaker said, this nation would endure, revive and prosper.
He goes to say that they only thing that they had to fear was fear itself. He said this to show that fear may keep them from advancing when they should have done so.
The president used the words such as revive to show that the nation was still capable of enduring and coming out of the dark times that they were in.
From these words we can see that the president was logical and also sincere in what they were passing through and how they were to overcome it.
<h3>What is a clear, Logical and sincere quote?</h3>
These are words that are said to convey the truth about given situations in simple and well defined terms.
Such words are said to show that the speaker has good reasoning about the subject.
Read more on President Roosevelt's speech:
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