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

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