Answer:
For the first picture, I think it is C and the second one should be A.
Step-by-step explanation:
You use vertical lines and if it hits it multiple times it is not a function. Like if it hits two dots or something it is not a function. I hope that make sense, let me know if it doesn't.
P2 is 4 Hope this helps :)
7 x 396 = 2772
Rounded to the nearest ten; 2770
Rounded to the nearest hundred: 2800
Rounded to the nearest thousand: 3000