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Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Ineed with this problem 21 show steps