I think it is B, but I'm not fully sure.
        
             
        
        
        
Answer:
Sixth graders: 14
Seventh graders: 28
Eighth graders: 28
Step-by-step explanation:
To solve this you just have to use a rule of three to solve the percentages, remember that the 100% will be the 70 students, and we solve each case separetly:
70 students= 100%
sixth grades=   40%
Sixth grades= (40*70)/100
Sixth graders= 28
70 students= 100%
seventh grades=   20%
seventh graders=   (20*70)/100
Seventh graders=14
So if we have that the rest of the students are eighth graders, we just add up the sixth and seventh graders and withdraw them from the total:
28+14=42
70-42=28
SOwe have that the eighth graders are 28
 
        
             
        
        
        
Answer:
X =-3 I think
Step-by-step explanation:
Im not to sure giohg ohojhtjot
 
        
             
        
        
        
1. 51
2. 10
3. 14
4. 7
5. 13
6. 6
7. 4
8. 22
9. 29
10. 36
You just have to cross multiply and then divide it by 100
        
             
        
        
        
X > 50/-5
X>-10
The answer is B. :)