Below is the solution:
A(final)=16cm^2 ds/dT=6 da/dT=?
A=(s)^2 A=16cm^2 , s=sqrt(A) , s=sqrt(16) , s=4cm
da/dT=2(s)(6cm/sec) , da/dT=12cm/sec(s) , da/dT=12cm/sec (4cm)
Answer should be da/dT=48cm^2/sec
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