I tried to show all work.
 
        
        
        
Answer:
A debt means subtracting from the original value so a debt of $300 can be expressed as -300.
 
        
             
        
        
        
The Vertical Angles Theorem states that if two angles are vertical angles, then they are congruent .Given <A and <B are vertical angles so they are equal.
 <A=<B.
Measure of <A=x and <B=5x-80
Or  5x-80=x
Adding 80 both sides 
5x-80+80=x+80
5x=x+80
Subtracting x both sides
5x-x=x-x+80
4x=80
Dividing both sides by 4
x=20 
Measure of <A= x= 20 degrees.
 
        
                    
             
        
        
        
Answer:
what is the question
Step-by-step explanation:
 
        
             
        
        
        
Answer:
A
Step-by-step explanation:
7x² - 4x - 8 - [ -3x² - 3x - 3]
In subtraction, flip the sign of all terms in the minuend
    7x² - 4x - 8 
   <u> 3x² + 3x + 3</u>
    4x² - x - 5