Answer:
90
Step-by-step explanation:
90 degree angles are angles with a 90 degree turn
 
        
             
        
        
        
Step-by-step explanation:

 
        
             
        
        
        
Answer:
5(2x - 1)
Step-by-step explanation:
Given
2(x - 6) + 4(2x + 1) + 3 ← distribute both parenthesis
= 2x - 12 + 8x + 4 + 3 ← collect like terms
= (2x + 8x) + (- 12 + 4 + 3)
= 10x + (- 5)
= 10x - 5 ← factor out 5 from each term
= 5(2x - 1) ← in factored form
 
        
             
        
        
        
The answer is negative 80 or like this -80
        
             
        
        
        
Answer:
The element is Boron(B)
Step-by-step explanation:
This is because on the periodic table, it shows that Boron has 5 protons and 5 electrons