If you quadrupled the mass and tripled the radius of a planet, by what factor would gg at its surface change

4/3

Explanation:

We already know aforehand that the acceleration due to gravity on the surface of a planet is given as

GM/r²,

Now, if the mass is quadrupled, we would have

G4M/r²,

If the radius is then tripled, we would have again

G4M/3r²

And that is what we have, now, to get the factor that the acceleration changes is simply to compare it with the primary equation

HM/r² = G4M/3r²

And thus, we find out that the factor is 4/3 or 1.333

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

think its the third option