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Homework Statement
Find the rate of change of the area of a rectangle whose area is 75cm^2. The length is 3 times the width. The rate of change of the width is 2cm/second.
Homework Equations
The Attempt at a Solution
A=75 A'=?
L=3x= 15 L'=6
W=x=5 W'=2
A'=L'W+LW'
A'= (6)(5)+ (15)(2)
A'=60cm/sec
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