Tell which of the following variables are explanatory and which are response: 1. Cost of home and income 2. Study time and grade earned 3. Miles driven and gas consumed 4. Clothing size and weight

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