Homework Help: math

Posted by Melissa on Tuesday, January 3, 2012 at 6:18pm.

a certain antibiotic redues the number of bacteria in your body by 10% each dse, if 4 doses of the antibiotic are taken, what percent of the original bacterial population is left

math - Reiny, Tuesday, January 3, 2012 at 7:12pm
after 1st day .9 or 90% left
after 2nd day .9^2 or .81 or 81% left
after 3rd day .9^3 .......

etc

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