What would be the acceleration of gravity of a planet with four times the mass of earth but twice the radius?

-- Multiplying the mass by  4  multiplies the acceleration of gravity by  4 .

-- Doubling the radius multiplies the acceleration of gravity by (1/2²) = 1/4 .

-- Doing both multiplies the acceleration of gravity by  (4 / 4)  =  1 .

It doesn't change.  The acceleration of gravity on that planet
would be the same as it is on Earth.

Depotion can i think