The graph shows how many square feet of Gilly's garden she was able to landscape over the course of a week. According to the graph, approximately how many days did it take Gilly to plant 450 ft.^2 of her garden?

Based on the graph, Gilly landscaped 300 ft^2 in 4 days and 600 ft^2 in 6 days. This means she landscaped 300 ft^2 in the first 4 days and 300 ft^2 in the next 2 days, for a total of 6 days to landscape 600 ft^2. Therefore, if Gilly was able to landscape 600 ft^2 in 6 days, it would take her approximately 7.5 days to landscape 450 ft^2.