Which is the slope of the line that passes through the points (-3, 1) (4, -2)

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?

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Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2