OH, and its about 7 feet high
144/8 = 18
25
Standard studs are spaced 16" apart. 30 feet times 12 inches = 360 inches. 360 inches divided by 16 inches = 22.5. If you are measuring left to right, the right-side stud from the frame becomes the last one. Depending on how you will compensate for the extra 8" at the end, you will need 21 or 22 2x4s.
224
75
648
2 million square feet
648
84 yards ie 252 feet
A single layer will require 144 bricks.
648 bricks to build the walk
18 x 72 = 1296