Explanation:
12. C.
as we easily see the curve goes through the x-axis (y = 0, that's what is called a "zero") between x = -2 and x = -1.
13. B
a relative minimum is where the curve changes it general tendency coming from above and turns around going back up. no other point in the near neighborhood has a smaller y-value.
14. A
the y-value at x = 1 is about 4.5.
the graph is not symmetric about a line like x = 1, as it did not long look the same left and right of that line.
but if you rotate the graph around (1, 4.5) by 180°, you get the same graph again.
so, it is symmetric about the point (1, 4.5).
the limits are "consisting". if x goes to -infinity (all the way to the left), then y goes to -infinity too. and the same for +infinity.