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cpratt2558
02.03.2020 •
Mathematics
The radius of a circular oil spill after t minutes is given by r ( t ) = √ 25 t . Find the instantaneous rate at which the radius is growing after 31 minutes.
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Ответ:
The instantaneous rate at which the radius is growing after 31 minutes is![0.449 \ units/min](/tpl/images/0530/0146/ba8dd.png)
Explanation:
It is given that the radius of a circular oil spill after t minutes is given by
Simplifying, we have,
The instantaneous rate of change can be determine by differentiating with respect to t.
Thus, we have,
We need to determine the instantaneous rate of the radius after 31 minutes.
Hence, substituting
in the above expression, we get,
Substituting the value of
, we get,
Multiplying the denominator, we get,
Dividing, we have,
Thus, the instantaneous rate at which the radius is growing after 31 minutes is![0.449 \ units/min](/tpl/images/0530/0146/ba8dd.png)
Ответ: