Answer: the answer is C
Step-by-step explanation: AP3X
Answer:

Step-by-step explanation:
Answer:
Only B
Step-by-step explanation:
A has 2 pairs with the x as the number 2, so they are not functions.
B has all independent pairs with their own numbers
So only B is the correct answer.
Answer:
40°
Step-by-step explanation:
It's half the angle at the centre
½×80 = 40