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please help Question 20 The amount of rainfall per month in a certain city, can be approximated by y (t) = 1 + 0.7 cost,

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Question 20 The amount of rainfall per month in a certain city, can be approximated by y (t) = 1 + 0.7 cost, where t is months since January. Find y and use a calculator to determine the intervals where the amount of rain falling is decreasing (on the interval 0

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