document.write( "Question 607678: a food is dropped on the floor and is growing bacteria exponentially according to the model y=2e^kt where t is time in seconds\r
\n" ); document.write( "\n" ); document.write( "if there are 2 cells initially and 8 cells after 20 seconds, find the value of k for the bacteria and frind how much bacteria is on the food after 5 seconds
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Algebra.Com's Answer #382927 by ankor@dixie-net.com(22740)\"\" \"About 
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model y=2e^kt where t is time in seconds
\n" ); document.write( "if there are 2 cells initially and 8 cells after 20 seconds, find the value of k for the bacteria
\n" ); document.write( ":
\n" ); document.write( "\"2%2Ae%5E%2820k%29+=+8\"
\n" ); document.write( "divide both sides by 2
\n" ); document.write( "\"e%5E%2820k%29+=+4\"
\n" ); document.write( "using natural logs
\n" ); document.write( "20k = ln(4)
\n" ); document.write( "20k = 1.3863
\n" ); document.write( "k = \"1.3963%2F20\"
\n" ); document.write( "k = .0693
\n" ); document.write( ":
\n" ); document.write( "find how much bacteria is on the food after 5 seconds
\n" ); document.write( "y = \"2%2Ae%5E%285%2A.0693%29\"
\n" ); document.write( "y = 2.74 ~ 3 cells
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