Step one, divide both sides by -2
log8(x+1)=4
if the base is 10, and the 8 is together with (x+1): (cannot tell from the way it is written)
8(x+1)=10^4=10000
x+1=1250
x=1249
if the 8 is a base, 
8^4=(x+1)
x+1=4096
x=4095
        
             
        
        
        
∠ADC = 112°
∠ADC =6x + 7 + 12x - 3
Equate both:
6x + 7 + 12x - 3 = 112
Solve for x :
6x + 7 + 12x - 3 = 112
Combine like terms:
18x + 4= 112
Take away 4 from both sides:
18x = 108
Divide both sides by 18:
x = 6
Find ∠ADB:
6x + 7 = 6(6) + 7 = 43
Answer: ∠ADB = 43°
        
                    
             
        
        
        
You can find additive inverse to find integers and their opposites closed under addition.
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
Good Question but i don't know
 
        
             
        
        
        
<span>"Simplifying
0.2y = 0.5x + 0.1
 Reorder the terms:
0.2y = 0.1 + 0.5x
Solving
0.2y = 0.1 + 0.5x
Solving for variable 'y'.
 Move all terms containing y to the left, all other terms to the right.
 
Divide each side by '0.2'.
y = 0.5 + 2.5x
Simplifying
y = 0.5 + 2.5x"</span>