Answer:
360,360 groups of 5 people.
Step-by-step explanation:
We have been given that there are 15 people in an office with 5 different phone lines. We are asked to find groups of 5 people that can answer these lines, if all the lines begin to ring at once.
We will use fundamental principle of counting to solve our given problem.
There are 15 people to answer 1st line, that will leave us with 14 people to answer 2nd line. 
Now, we will have 13 people to answer 3rd line, that will leave us with 12 people to answer 4th line. 
There are 11 people to answer 5th call.
So 5 lines can be answered in  ways.
 ways.
Therefore, 360,360 groups of 5 people can answer these lines.
 
        
             
        
        
        
Answer:
159
Step-by-step explanation:
10^2+(3+5)^2-5
-> 100 + (3+5)^2 -5
-> 100 + 8^2 - 5
-> 100 + 64 - 5
-> 159
 
        
                    
             
        
        
        
Answer:  -2
Explanation: The coefficient is the number to the left of the variable. 
Another example would be that 10xy has the coefficient 10.
Something like x^2 has coefficient 1 because x^2 = 1x^2.
 
        
             
        
        
        
I think that whole numbers and natural numbers are the same set:- 1, 2, 3, 4 etc