1. In a week there are 7 days. So your andwer would be 21/10. The decimal is 2.1.
        
             
        
        
        
There ya go! The answer is 8 rows. Added a picture to show you my work :)
 
        
        
        
It would be 4. in the equation y=mx+b, b is the y-intercept.
        
                    
             
        
        
        
No. You can’t add the two lower numbers up to make the bigger number making them not a triangle.