The coefficient is the number that is beside the variable so that answer is 18 . The constant is the number that has no variable so that one is 36.
8 yards is equal to 8*3 = 24 feet. 2/3 * 24 ft = 16 feet = 5 1/3 yards
So Bill will receive more Extra yield for Bill=2560-2200=360 Answer=$ 360.00