It is given that
 a+b=20  -------------------- (1)
b+c=30 -----------------------(2)
We have to calculate
3 a + 4 b +7 c
Now multiplying equation(1 )by 3,we get
3 a+ 3 b=60  ----------------------------------(3)
and Multiplying equation( 2) by 4,we get
4 b + 4 c=120  -----------------------------------(4)
Adding expression (3) and (4),we get i.e left hand side of 3 to left hand side of 4 and right hand side of 3 to right hand side of 4.
3 a+ 3 b+ 4 b+ 4 c=60+120
Adding like terms, we get
3 a+ 7 b+ 4 c =180, Which is the required solution.
 
        
             
        
        
        
The graphical representation is give in image 
 
        
             
        
        
        
Step-by-step explanation:
step 1. shifting f(x) up by one simply adds 1 to f(x).
step 2. if g(x) = x^2 then f(x) = x^2 + 1.
 
        
             
        
        
        
The answer is the third one aka C. 
There must not be two points on the same y-axis because that doesn't make a function but a relation instead.
C. doesn't have 2 points on same y-axis and therefore the third picture is the relation that's a function. 
 
        
             
        
        
        
32 = 2^5 <==== my answer is too short..lol