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The slope of a horizontal line is zero.
The slope of a horizontal line is zero. That's because the slope measures how steep the line is, and a flat line is not steep at all and therefore has no slope.
A slope is 0 if it is a straight horizontal line. A slope is undefined if it is a straight vertical line.
The slope of the tangent line at the maximum point of the curve is zero. So we say that as a curve point approaches to the maximum point, the slope of the tangent line at that point approaches to zero.
The slope is 0. If it were vertical, the slope would be undefined. APEX ZERO