So 3/10 green and 1/5 blue.  First, let's convert them into equal fractions.  Now we have 3/10 and 2/10.  When combined, it is 5/10.  That means there is a 50% chance you will land on blue or green.
        
             
        
        
        
Answer:
$4.12
Step-by-step explanation:
$26.78 / 6.5 gallons = $4.12 per gallon
 
        
                    
             
        
        
        
A because a colored circle means it’s greater than
        
             
        
        
        
Is there like a picture or something?
        
                    
             
        
        
        
Answer:
1120 combinations of four teachers include exactly one of either Mrs. Vera or Mr. Jan.
Step-by-step explanation:
The order in which the teachers are chosen is not important, which means that the combinations formula is used to solve this question.
Combinations formula:
 is the number of different combinations of x objects from a set of n elements, given by the following formula.
 is the number of different combinations of x objects from a set of n elements, given by the following formula.
 
In this question:
1 from a set of 2(Either Mrs. Vera or Mr. Jan).
3 from a set of 18 - 2 = 16. So

1120 combinations of four teachers include exactly one of either Mrs. Vera or Mr. Jan.