A drug in the bloodstream has a concentration of c(t) =at/t^2 +b

A= 3, b=1
Determine how long it takes for the drug to drop below 0.2 solve algaebraically

Find algaebraically when c(t) less then 0.5

Rose,

It was pointed out to you both by me and by Bosnian, that your question makes no sense.
http://www.jiskha.com/display.cgi?id=1448886577

Yet you have posted it again the same way.
Did you read our reply?