AP Precalculus Quiz
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TRIGONOMETRIC AND POLAR FUNCTIONS
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Average monthly temperature is modeled by M(t)=12cos⁡ ⁣(2π12(t−7))+15M(t)=12\cos\!\left(\frac{2\pi}{12}(t-7)\right)+15, with tt in months and t=1t=1 as January. The amplitude is 1212°C and the vertical shift is 1515°C. The model peaks in midsummer and bottoms in midwinter. The period is one year, matching seasonal repetition. Based on the scenario, determine the phase shift of the function and explain its significance.
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