The numbers going to the left on a number line means the values are smaller and the numbers going to the right means the values are bigger. 
Take the value '0' for example, the value on the right of zero is '1', which is a value bigger than zero, and the value to the left of '0' is '-1', which is a value smaller than zero.
 
        
        
        
Answer:
21 + x < 28
Step-by-step explanation:
27 is in fact greater than 28 if you where to input 6 into the x spot, this is the only one that's a true expression. 
 
        
             
        
        
        
Answer:
thank you so much!
Step-by-step explanation:
 
        
             
        
        
        
Answer:
13 means the starting number 
13 is the y-intercept (0,13)
 
        
             
        
        
        
Answer:
 $58.26.
Step-by-step explanation:
Total cost without sales tax and tip =  3 * 6.25 + 3 * 7.50 + 6 *1.25 
= $48.75
Plus Sales tax and tip: 
= 48.75 + 0.045*48.74 + 0.15*48.75
= $58.26.