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fA circle is growing, its radius increasing by 4 mm per second. Find the rate at which the area is changing at the moment when
\fA circle is growing, its radius increasing by 4 mm per second. Find the rate at which the area is changing at the moment when the radius is 21 mm. When the radius is 21 mm, the area is changing at approximately 527 768 (Round to the nearest thousandth as needed.) Use Ay ~ f'(x)Ax to find a decimal approximation of the radical expression. 155 . . . What is the value found using Ay ~ f'(x)Ax? 155 ~ 12.450 (Round to three decimal places as needed.)
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