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Freezing temperature. Ethylene glycol and propylene glycol are liquids used in antifreeze and deicing solutions. Ethylene glycol is listed as a hazardous chemical by the Environmental Protection Agency, while propylene glycol is generally regarded as safe. Table 11 lists the freezing temperature for various concentrations (as a percentage of total weight) of each chemical in a solution used to deice airplanes. A linear regression model for the ethylene glycol data in Table 11 is
where
(A) Draw a
(B) Use the model to estimate the freezing temperature to the nearest degree of a solution that
is 30% ethylene glycol.
(C) Use the model to estimate the percentage of ethylene glycol in a solution that freezes at
15°F.
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