calculus
posted by kela .
A common inhabitant of human intestines is the bacterium Escherichia coli. A cell of this bacterium in a nutrientbroth medium divides into two cells every 20 minutes. The initial population of a culture is 51 cells.
(a) Find the relative growth rate. (Assume t is measured in hours.)
b)Find an expression for the number of cells after t hours.
(c) Find the number of cells after 8 hours.
(d) Find the rate of growth after 8 hours. (Round your answer to three decimal places.)
(e) When will the population reach 20,000 cells? (Round your answer to two decimal places.)

Looks like your instructor is just changing the numbers from one year to the next
Just change the numbers in this solution
http://www.jiskha.com/display.cgi?id=1257718340