The length of a rectangle is increasing at a rate of 3 in/mi…

The length of a rectangle is increasing at a rate of 3 in/min and the area is increasing at a rate of 8 in2/min.  At what rate is the width changing when the length is 12 in and the area is 120 in2? Credit will only be given if your work clearly shows and labels each of the following steps:    (a) Formula    (b) Derivative   (c) Solution  Type your answer in the field below and be sure to show your work on your paper. 

The length of a rectangle is increasing at a rate of 6 in/mi…

The length of a rectangle is increasing at a rate of 6 in/min and the area is increasing at a rate of 10 in2/min.  At what rate is the width changing when the length is 15 in and the area is 150 in2? Credit will only be given if your work clearly shows and labels each of the following steps:    (a) Formula    (b) Derivative   (c) Solution  Type your answer in the field below and be sure to show your work on your paper.