Hi there!
The word "of" is the same thing as a multiplication sign.
1) 
20% = 0.2
0.2 × 20 = 4
2) 
? × 30 = 15
divide each side of the equation by 30
? = 0.5
0.5 = 50%
3)
50% = 0.5
0.5 × ? = 50
divide each side of the equation by 0.5
? = 100
There you go! I really hope this helped, if there's anything just let me know! :) 
 
        
                    
             
        
        
        
Answer and Step-by-step explanation:
We are not given the function in question, but in order to explain, will form a function. Suppose f(x) = 3x + 2.
If f(x) = 17, then 
3x + 2 = 17, to find the value of x, we have solve for x in the equation.
3x = 17 – 2
3x = 15
x = 5
This is the method that can be used to solve problems of this nature.
 
        
             
        
        
        
8x2+6x-2 
I think! because 8,6, and 2 are all divisible by 2 
and 3. Factor the quadratic 
2(4x-1)(x+1)
        
             
        
        
        
Answer:
167.46
Step-by-step explanation:
 




 
        
             
        
        
        
Answer:122
Step-by-step explanation:
Supplementary just means two angles sum to 180.