document.write( "Question 57254This question is from textbook Applied College Algebra
\n" ); document.write( ": Pseudoephedrine hydrochloride is an allergy medication. The polynomial function
\n" ); document.write( "L(t) = 0.03t^4 + 0.4t^3 - 7.3t^2 + 23.1t
\n" ); document.write( "where 0< or equal to t < or equal to 5, models the levels of pseudoephedrine
\n" ); document.write( "hydrochloride, in milligrams, in the bloodstream of a patient t hours after 30 milligrams of the medication have been taken.
\n" ); document.write( " At what times, to the nearest minute, does the level of pseudoephedrine hydrochloride in the bloodstream reach 12 milligrams? \n" ); document.write( "
Algebra.Com's Answer #39067 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
L(t) = 0.03t^4 + 0.4t^3 - 7.3t^2 + 23.1t
\n" ); document.write( "12= 0.03t^4 + 0.4t^3 - 7.3t^2 + 23.1t
\n" ); document.write( "0.03t^4 + 0.4t^3 - 7.3t^2 + 23.1t-12=0
\n" ); document.write( "Graphing it with a TI-83 I find zeroes at
\n" ); document.write( "t=0.6467...;3.6304...;6.93929...
\n" ); document.write( "There is another zero but I cannot find it.
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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