A bar of zero height would be invisible. So, there is nothing to plot, just leave that space blank.
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The positive regions of a function are those intervals where the function is above the x-axis. It is where the y-values are positive (not zero). The negative regions of a function are those intervals where the function is below the x-axis. It is where the y-values are negative (not zero).
The horizontal axis can be used with zero where the axes meet. usually the positive are to the right and negative to the left. but any axis can be used if defined as such.
It is not possible to answer the questions since there is no such thing as a zero axis.
Very cold, usually snow and ice on the ground. Just kidding A line that is 30 degrees below zero is 1/3 the distance between the X and the Y axis (the line is closer to the X than the Y axis), with all the X values being positive and the Y values being negative.