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?

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter19: Achievement Review—section One
Section: Chapter Questions
Problem 31AR: A shaft is turned in a lathe at 120 revolutions per minute. The cutting tool advances 0.030 inch per...
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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 decreasing by 10 cm sq. per sec
B decreasing by 5 cm sq. per sec
increasing by 4 cm sq. per sec
increasing by 13 cm sq. per sec
Transcribed Image Text: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 decreasing by 10 cm sq. per sec B decreasing by 5 cm sq. per sec increasing by 4 cm sq. per sec increasing by 13 cm sq. per sec
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