Answer:
B) 18.
Step-by-step explanation:
Add them up then divide by the amount of numbers there are.
 
        
                    
             
        
        
        
Use the interior angles theorem for the triangles I hope my answer helped if you have any questions don't be afraid to ask <span>(o^▽^o) <3</span>
        
                    
             
        
        
        
Y =ax² + bx +c
1) Point (0,7)
7 = a*0² +b*0 +c
c = 7
y=ax² + bx + 7
2) Point (1,4)
4=a*1² + b*1 + 7, ----> 4 = a +b + 7, ------> 
a+b= - 3
3) Point (2, 5)
5=a*2² + b*2 + 7, ----> 5=4a+2b +7,---> -2=4a+2b, ----> 
-1=2a + b
4)  
a+b= - 3, ----> b= -3 - a (substitute in the second equation)
    2a+b= -1
2a - 3 - a = -1, ----> a - 3 = -1, 
a =2
5) a+b= - 3
    2 + b = -3
b = -5
y=2x² - 5x + 7
 
        
        
        
Umm i not that sure but i think its a
        
                    
             
        
        
        
There would be 3 2/12 left.
2/3 x 1/4 = 2/12
Hope this helps!
Sorryyyy :C