Question 1074729
Original Rectangle, dimensions w and 4w
{{{A=w(4w)}}}
{{{A=4w^2}}}


Increased Width Rectangle, width plus 3, dimensions w+3 and 4w
{{{A[i]=(w+3)*4w}}}
{{{A[i]=4w^2+12w}}}



AMOUNT OF INCREASE OF AREA
{{{A[i]-A}}}
{{{4w^2+12w-4w^2}}}
{{{highlight(12w)}}}