The expression is not equivalent to  .
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<h2>Polynomial</h2>
An expression of more than two algebraic terms, basically sums of terms and variables of power n.
<h2>Given</h2>

<h2>Step by step explanation</h2>

Then the expression is not equivalent to  .
.
Thus, the expression is not equivalent to  .
.
More about the polynomial link is given below.
brainly.com/question/17822016
 
        
             
        
        
        
F(x)= 9x^3 + 2x^2 - 5x + 4 
g(x)= 5x^3 - 7x + 4
f(x) - g(x)
9x³ + 2x² - 5x + 4 - (5x³ - 7x + 4)
9x³ + 2x² - 5x + 4 - 5x³ +7x - 4
9x³ - 5x³ + 2x² -5x + 7x + 4 - 4
4x³ + 2x² + 2x 
        
             
        
        
        
Answer:
   = 124 ft
Step-by-step explanation:
Perimeter of a rectangle is 
P = 2(l+w)
We know the length is 13 and the width is 49
P = 2(13+49)
    =2(62)
    = 124 ft
 
        
                    
             
        
        
        
For this question,The answer is, x=-9
        
             
        
        
        
Answer:
132 feet
Step-by-step explanation:
Given that Alejandro is standing at a distance of 140 feet from the base of the tree and his eyes are 6 feet above the ground.
Let AB is the height of the tree and point E is the location of his eyes which is 6 feet above from C on the ground as shown in the figure.
The distance between points A and C, AC=140 feet.
Drawing a horizontal line from point E which meets AB at point D as shown.
As ACED forms a rectangle, so 
AC=DE=140 feet ...(i)
CE=AD= 6 feet ...(ii)
The height of the tree, AB=AD+DB
By using equation (ii),  AB=6+DB ...(iii)
Now, given that the on watching the top of the tree, the reading on the clinometer is 42 degrees.
So,
In triangle DEB,

 [from (i)]
 [from (i)]
 feet
 feet
From equation (iii) the height of the tree is
AB=6+126=132 feet.
Hence, the height of the tree is 132 feet.