I think it is 10 because 18×10=180 but it is close hope this helps
        
             
        
        
        
Answer:
Let p represent the # of pages in the book.  Then, Nora has already read 0.30p pages and has 0.70p pages left to read.
If she reads 25% pages/night, that means reading 0.25(0.70)p pages per night, or 17.5 pages/night.  If 28% p/n, that means 0.28(0.70)p pages/night, or 19.6p pages/night.
How many nights will it take Nora to finish the book if she reads 25% of 7/10 of the book per night?  Without any calculations, we can answer this by "4 nights, since she reads 1/4 of the unread portion of the book per night."
If she reads 28% of 7/10 of the book per night, that will require fewer nights:
First night:  28%
Second night:  28%  
Third night:  28%
  Total:  3(28%) = 84%
This leaves 16% to read on the final night.
This is one interpretation of what I think is a poorly worded question.
The author of this question might have meant reading 25% of the remaining unread pages per night, which leads to a different answer.
 
        
             
        
        
        
Answer:
you divide -8y by both sides and you would so that means that y=-2.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
80/1 1/4 (Fraction)
Step-by-step explanation:

 
        
             
        
        
        
Answer:
I am not sure but I think that it is the second set?
Step-by-step explanation: