The length of the rectangle is increasing at a rate of 5 cm per second, and its width is decreasing at a rate of ... 3 cm per second. When the length is 4 cm and the width is 5 cm, how fast is the area of the rctangle changing at that instant? A increasing by 13 cm sq. per sec B) decreasing by 10 cm sq. per sec decreasing by 5 cm sq. per sec increasing by 4 cm sq. per sec

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