He will only need to sell one
A. w= -22 so A has a negative solution.
D doesn't have a variable so I'm not sure about it (did you type it correctly?), but because only one side of the equation has a negative number, I'm guessing D is also a negative solution
Answer: (3,4)
Each input can only have one output for a function
The other pairs give a different output for the input so that would make it a relation not a function.
Answer:
$13,230
Step-by-step explanation:
you need to multiply the cost of the ticket by the amount of tickets sold,
630 x 21 = $13,230