Question 1010761
.
A) 
.
W=width=7y-3y=4y
.
Length of garden is length of green area:
L=Length of green area=Total length-length of non-green area
{{{L=(8^6+7z)-(7^6+8)}}}
{{{L=(262144+7z)-(117657)}}}
{{{L=144487+7z}}}
.
P=Perimeter=2(L+W)
P=2((144487+7z)+(4y))
P=288974+14z+8y
ANSWER: The perimeter of Sunehra's garden is 288974+14z+8y.
.
B)
N=New Perimeter=9y(P)
{{{N=9y(288974+14z+8y)}}}
{{{N=2600766y+126yz+72y^2}}}
ANSWER: The new perimeter is {{{72y^2+126yz+2600766y}}}
.