Answer:
No it is not a function because the 10 in the input is repeated twice (the arrow is connected to 2 numbers)
D= {7, 9, 10}
R= {7, 9, 8, 10}
The pairs are (7, 7), (9, 9), (10, 8), (10, 10)
If a=0, then the denominator is equal to 0. Since you cannot divide by zero, you are not allowed to do this.
Hope This helps!
