The table shows the side length and approximate area of an octagonal stop sign. Area of a Stop Sign A 2-column table with 5 rows. The first column is labeled side length (inches), x with entries 5, 10, 15, 20, 25. The second column is labeled area, f(x) with entries 120; 480; 1,080; 1,920; 3,000. Which function can be used to compute the approximate area, in square inches, of a stop sign if it has a side length of x inches? f(x) = 4.8x2 f(x) = 4x2 f(x) = (4.8)x f(x) = (4)x