Answer:
A, C, and D all do because if you were to hold a pencil up vertically, the line would only intersect it once, if it intersected more, it is not a function
Step-by-step explanation:
Quite simple when you take out the useless stuff you added in. Its 16
Answer:
i would say B/90
Step-by-step explanation:

Because there's one 3 & four 7's .

Because there are two 2's & four 9's