Answer:
a. The Mexican Airline offers a better deal for 9 students to travel.  
b. 10 students
Step-by-step explanation:
a. The Mexican Air airline offers a round trip airfare of $250 per person.
So, for 9 students the fare will be total $(250 × 9) = $2250
Now, the Fiesta airline offers a round trip airfare of $150 per person if the club agrees to pay a one-time group rate processing fee of $1000.
So, for 9 students the total fare will be = $[1000 + (150 × 9)] =$2350.
Therefore, the Mexican Airline offers a better deal for 9 students to travel.  (Answer)
b. Let for x students both the airline offers the same total costs.
Then we can write  
250x = 1000 + 150x {From the conditions given}
⇒ 100x = 1000
⇒ x = 10
So, if the number of students is 10, then only both the airlines will take same fare. (Answer)
 
        
             
        
        
        
9514 1404 393
Answer:
   (x, y) = (2/5, 1)
Step-by-step explanation:
Substitute for y and solve for x.
   1 = -5x +3
   -2 = -5x . . . . . . subtract 3
   2/5 = x . . . . . . divide by -5
The solution is (x, y) = (2/5, 1).
 
        
             
        
        
        
Answer:
7238.23
Step-by-step explanation:
v=4/3πrcubed
solve it and get the answer