The arrangement of the spectral colors are determined by how the human eye and brain work. There is no clear reason to believe that different people or animals see the spectrum the same. In fact it is easy to show that they don't.
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Horizontal lines always have a slope of zero. (i.e completely flat, level surfaces have a slope of zero). However a line does not have to have a slope of zero in order to be a line.
Yes. A t has a perpendicular line but in order to form a right angle you need to have the lines intersect.
The slope of any parallel lines is always the same. Parallel means they are co-planar which means lie in the same plane, and never intersect. In order for the lines to not intersect you would need the same slope. In this case the answer is -2/3.
Always.
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