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Last week, the thickness of the ice on a lake increased by (25)/(t+3) centimeters per day (where t is the number of days since the ice first formed). By how may centimeters did the thickness of the ice increase between t=0 and t=4?

 Mar 24, 2021
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t = 0   + t =1    + t = 2   + t = 3   + t = 4

         

 

25/3  +  25/4    + 25/5   + 25/6   + 25/7    =  27.32 cm          ( this includes day 0 and day 4  increases in thickness)

 

BETWEEN days 0 and 4    would only include days 1   2    3     ( the red ones above)  = 15.42 cm       Not sure which answer is the one you want

 Mar 24, 2021

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