Answer :
c. 770.36
first you find the length of garden using area=lw formula -> w=8 ft
find perimeter of garden
p= 2l + 2w -> 40 ft
subtract 3 ft for the gate
40ft -3ft= 37ft
need to find 37ft of fencing
37ft× 17.31= $640.47
add that to the price for the gate
$640.47 + $129.89 = $770.36
first you find the length of garden using area=lw formula -> w=8 ft
find perimeter of garden
p= 2l + 2w -> 40 ft
subtract 3 ft for the gate
40ft -3ft= 37ft
need to find 37ft of fencing
37ft× 17.31= $640.47
add that to the price for the gate
$640.47 + $129.89 = $770.36