What is the slope of the function

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

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

Meee i honestly dont know what this question talking about