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3. Equal numbers of fibroblasts and endothelial cells are present initially in a culture. 


a. If

the endothelial cells double every 40 hours and the fibroblasts double every 20 hours, draw a graph showing the percentage of cells in the culture that are fibroblasts as a function of time (you can use excel).

b. Come up with an equation to determine the time at which 90% of the cells will be fibroblasts and solve for time. Explain how you came up with your equation.

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