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As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume

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As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume

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As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume that the current image is 4 cm × 3 cm. Find the rate at which the area of the image is changing (dA/df) if the length of the image is changing at 0.6 cm/s and the width of the image is changing at 0.2 cm/s.

▸ 5.2 cm²/sec

▸ 6.0 cm²/sec

▸ 3.0 cm²/sec

▸ 2.6 cm²/sec

Textbook

Calculus: Early Transcendentals

Edition: 3^rd

Authors: Briggs, Cochran, Gillett, Schulz

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