<PRE><B>Question 802474</B>
Strain A started with 6000 cells and decreased at a constant rate of 2000 cells per hour. Strain B started with 2000 cells and decreased at a constant rate of 1000 cells per hour. When will the strains have the same number of cells? 
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A(x) = 6000 - 2000x
B(x) = 2000 - 1000x
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Solve:: A(x) = B(x)
6000-2000x = 2000-1000x
1000x = 4000
x = 4 hrs
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Cheers,
Stan H.</PRE>