F(-4)=G(-4) because when the two lines cross over the f line is at the -4 and same with G
        
             
        
        
        
Alright, 
you will need to solve for each variable to find if they got the equation correctly or not.. 
Let's start with h 
isolate h 
(1/2)h = A/(b1+b2)
Now we need to get rid of 1/2 we may do so by multiplying both sides by 2 
h = 2(A/(b1+b2))
And that's not how they did it for h so Option D doesn't apply 
Let's see C
Also doesn't apply since they multiplied 2 only by A rather than A/h
Let's see B
Also not correct they made the same mistake as with option C
Let's see A
again same mistake 
when multiplying both sides by 2 
the 2 should be as following 

I believe you should contact your instructor and explain that non of the options is right. 
 
        
        
        
Answer:just start at 7 and go out 2 up 1 
Step-by-step explanation:
Edit:sorry ment -7
 
        
             
        
        
        
Answer:
Step-by-step explanation:
-7/2
Decimal form:
-3.5
Mixed fraction:
-3 1/2
Continued fraction:
- [3; 2]
Egyptian fraction expansion:
-4 + 1/2
 
        
             
        
        
        
18.88 divided by 1.6 is 11.8.