A = area the available pumpkin seeds cover= 350 square feet
w = width of the garden = 18 feet
L = length of the garden = 22 feet
A' = area of the garden
Area of the garden is given as
A' = L w
inserting the values
A' = 22 x 18
A' = 396 square feet
clearly , we see that the area of garden is greater than the area the available seeds can cover
A' > A Since 396>350
hence she does not have enough pumpkin seeds to fill the whole garden.