X^2 + 4x -21
= (x +7)(x - 3)
hope that helps
        
             
        
        
        
Answer:
3:48 P.M
because you add all the number making sure it's not greater than 60 and carry over to the next hour if it is
 
        
                    
             
        
        
        
The equation you use for the slope of this kind of problem is (y2-y1)/(x2-x1). x1 is the first X coordinate, x2 is the second, y1 is the first y coordinate, y2 is the second. 
(5-3)/(2-2)
2/0
This equation has an UNDEFINED SLOPE, as it is just a vertical line. 
        
             
        
        
        
Answer: An x and y value, parenthesis around the values, and a comma in between them.
Examples of ordered pairs: (2, 5), (1872, 1683), (-3, 7), (7/8, -10/2)