Answer:
x= -4
Step-by-step explanation:
=> 1+2x= 4x+9
=> 1-9=4x-2x
=> -8 = 2x 
=> x = -8/2 
=> x= -4
hope it's helpful to you ☺️
 
        
                    
             
        
        
        
Answer:
y=-0.215x^2+35
Step by Step:
Let, 
,  
, 
, 
We know that, the general equation of the parabola.
    

Substitute the  value of 
 in equation 
 and find the value of 
   






Hence, the equation of the parabola is:

 
        
             
        
        
        
Wait so are the sides of the octagon 9 inches each or do we have to find that?
 
        
             
        
        
        
Question: 
Yuet solved the equation 
 for a. 
Her steps are shown below. 
1. Subtract 2b: 
2. Divide by 6: 
Answer:
In step 1 she needed to add 2b to both sides of the equation.
Step-by-step explanation:
Given:
The above steps shows how Yuet solved an equation
Required:
True statement about Yuet's work
The implication of the statement is to state what Yuet should have done instead of what she did.
In step 1, she subtracted 2b from both sides of the equation; this is wrong.
Instead of subtracting, she ought to add 2b to both sides of the equation.
The correct steps and result is as follows:
1. Add 2b: 
2. Divide by 6: 
Hence, we can conclude that in step 1 she needed to add 2b to both sides of the equation.