Answer:
Two angles are called supplementary when their measures add up to 180 degrees.
Step-by-step explanation:
A unit is a measurement. for example, a unit could be an inch, or it could be a foot. to convert you need the exact measurement so if a line is 12 inches it's 1 foot. if it is 13 then it stays in inches. You convert units to the easiest variable to calculate and then you solve your equation from there.
Hope I helped! :)
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The answer is C. “-5a-4” just combine like terms