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in arithmetic,variables look like
Chemists devised a measurement system called the pH scale to indicate the concentration of hypotonic ions in solution. Therefore the higher the pH scale gets the more persistant it is.
Descriptive, non-numeric, qualitative. Furthermore, they cannot be ordered (as in small, medium, large)
No changes at all Also look on your notes
The Degree (for a polynomial with one variable, like x) is the largest exponent of that variable.