The answer is 5 :4
please mark as brainliest thanks'!!!
        
             
        
        
        
Answer:
27) 14x
28) n/9
29) A number, z, divided by 11
30) The sum of a number, z, and 11
 
        
             
        
        
        
Answer:
The students can group themselves in 360360 ways
Step-by-step explanation:
For this exercise we need to use the following equation:

This equation give us the number of assignation of n elements in k cell, where n1, n2, ..nk are the element that are in every cell
In this case we have 15 student that need to be assign in three vehicles with an specific capacity. This vehicles would be the equivalent to cells, so we can write the equation as:
   
Because the first vehicle have 7 seating, the second vehicle have 5 seating and the third vehicle have 3 seating.
Solving the equation we get 360360 ways to organized 15 students in three vehicles with capacity of 7, 5  and 3 seating.
 
        
             
        
        
        
Answer: look at the picture 
Step-by-step explanation: Hope this help :D
 
        
             
        
        
        
Answer:
not a function
Step-by-step explanation: