The equation of a horizontal line in standard form will always have a(an) value of 0

The answer is slope.
Since slope is rise over run and horizontal lines always have a run but never a rise, their equation for slope is always 0 divided by a number.
0 divided by any number is always 0, so the slope of a horizontal line is always 0.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.