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The number of research articles in a prominent journal written by researchers can be approximated by

`U(t)=(4.7e^(0.6t))/(0.4+e^(0.6t)) thousand articles per year ,(t>=0)`

where

`t`

is time in years (

`t=0`

represents 1983). (a) Find an (approximate) expression for the total number of articles (in thousands) written since ). HINT [See Example 7.] (Round your coefficients to two decimal places.)

`N(t)=`

(b) Roughly how many articles were written from 1983 to 2003? (Round your answer to the nearest whole number.) thousand articles Need Help?ask a expert