document.write( "Question 1124526: An epidemiological study of the spread of a certain influenza strain that hit a small school population found that the total number of students, P, who contracted the flu t days after it broke out is given by the model
\n" ); document.write( "P = −t^2 + 17t + 180, where 1 ≤ t ≤ 6.
\n" ); document.write( "Find the day that 240 students had the flu. Recall that the restriction on t is at most 6.
\n" ); document.write( "t = \n" ); document.write( "

Algebra.Com's Answer #740897 by josmiceli(19441) $\"\"$ $\"About$

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$\"+P+=+240+\"$
\n" ); document.write( " $\"+-t%5E2+%2B+17t+%2B+180+=+240+\"$
\n" ); document.write( " $\"+-+t%5E2+%2B+17t+-+60+=+0+\"$
\n" ); document.write( " $\"+%28+-t+%2B+12+%29%2A%28+t+-+5+%29+=+0+\"$
\n" ); document.write( " $\"+t+=+12+\"$
\n" ); document.write( " $\"+t+=+5+\"$
\n" ); document.write( "The lower value is OK, $\"+1+%3C=+t+%3C=+6+\"$
\n" ); document.write( "On the 5th day 240students got the flu
\n" ); document.write( "Here’s the plot:
\n" ); document.write( " $\"+graph%28+700%2C400%2C+-5%2C+30%2C+-30%2C+300%2C+-x%5E2+%2B+17x+%2B+180+%29+\"$ \r
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