document.write( "Question 1057106: Problem 3: \n" );
document.write( "The average level of air pollution in a certain city varies during the day as follows:\r \n" );
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document.write( "𝑝(𝑡)={ \n" );
document.write( "2+4𝑡 𝑖𝑓 0≤𝑡<2 \n" );
document.write( "6+2𝑡 𝑖𝑓 2≤𝑡<4 \n" );
document.write( "−𝑡2+16𝑡−34 𝑖𝑓 4≤𝑡<12 \n" );
document.write( "50−3𝑡 𝑖𝑓 12≤𝑡<16\r \n" );
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document.write( "where 𝑡 is time in hours after 6am (𝑡=0 corresponding to 6am and 𝑡=16 corresponding to 10pm). \n" );
document.write( "a. Graph this function \n" );
document.write( "b. What are the pollution levels at 8am, 12noon, 6pm and 8pm? \n" );
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![\"\"](\"/images/stars/stars-13.gif\")
![](\"/cgi-bin/display-illustration.mpl?tutor=Fombitz&illustration_name=fr2.JPG\")
. \n" );
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