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finding average high temperature

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The monthly average high temperature, y, in degrees Fahrenheit at Phoenix, Arizona, can be modeled by y = 20.3sin(0.53x−2.18) + 83.8 where x = 1 corresponds to January, x = 2 corresponds to February, and so on. Estimate numerically when the monthly average high temperature is 93◦ F.
asked Aug 8, 2017 in Math by jerrod

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