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How fast is formaldehyde level of the average house dropping

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Reference no: EM131560342

Question: FORMALDEHYDE LEVELS A study on formaldehyde levels in 900 homes indicates that emissions of various chemicals can decrease over time. The formaldehyde level (parts per million) in an average home in the study is given by

f(t) = 0.055t + 0.26          (0 ≤ t ≤ 12)      
                t + 2

where t is the age of the house in years. How fast is the formaldehyde level of the average house dropping when it is new? At the beginning of its fourth year?

Reference no: EM131560342

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