Which of the scatter plots below shows the most accurate line of best fit?

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120

Which one is the correct answer, and why?

If np3 /nc2 = 6, find the value of n