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Temperature and equations

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The change in temperature in a certain chemical reaction is given by the equation:
 
T(x)= -0.324x3 + 10.3x2 - 3.23
 
Where x is the length of elapsed time since the start of the reaction (in minutes?) and T(x) is the temperature generated by the reaction in degrees Celsius. What is the temperature of the reaction after 6 minutes? Show Work.
 
Just plug x=6 into the equation:
 
T(x=6) = -0.324(6)3 + 10.3(6)2 - 3.23 = ?  oC

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