Explanation:
5.
normally no.
just think - we are talking about people. it's it possible to have half of a friend at a game ?
no, the input is not possible.
but if this function is used in the context or a larger analysis, and mean values are created and checked, then it might be valid.
it all depends on the context of how the function is used.
2.
we don't see all answer options, but the range is the interval or set of all valid y-values (the 2nd number in an ordered pair).
we see : -1, 3, 4, 6
whichever answer option shows this is correct.