I think the answer is b but I am not quite sure
The answer to z would be 4
hope this helps :)
In general we know
1 meter = 1.09361 yard.
So we can say
1 yard =

meter
= 0.9144 meter.
So 120 yards =

meter
= 109.728 meter.
So length of football field is 109.728 meter.
Answer:
b
the points make a sad face on the graph and if you do the vertical line test you can see that its a function