Is y=2x an inverse variation

Write the equation in logarithmic form m^x=n

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

Find the maximum value of p= 4x + 5y subject to the following constraints :