document.write( "Question 1106185: A stone is thrown into a lake and a circular ripple moves out at a constant speed of 1m/s. Find the rate of change of the circle’s area at the moment when t= 4s. \n" ); document.write( "

Algebra.Com's Answer #721136 by ikleyn(52864) $\"\"$ $\"About$

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document.write( "You are given for the radius R(t) = t, where \"t\" is time in seconds.\r\n" );
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document.write( "The area of the circle is A(t) =  = .\r\n" );
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document.write( "The rate of change of the circle’s area is   = .\r\n" );
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document.write( "At t = 4 seconds,   =  =  = 25.12 m^2/s.\r\n" );
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