Deriving mass of Earth from definition of gravity

[jrw]

Homework Statement

Using the definition of gravity, derive the mass of the Earth

Homework Equations

I am unsure if this is simply a plug n chug problem and I am over thinking it or there is some way to use calculus to derive the mass from the gravity equation.

The Attempt at a Solution

I am looking at the equation a=GM(earth)/r^2
I know I can simply find these values in my textbook, but I don't see why it would be that simple of a problem. So I just feel like there must be something I am missing.

 

[phyzguy]

I don't think you're missing anything. Plug-n-chug away!

 

[jrw]

I don't think you're missing anything. Plug-n-chug away!

awesome thank you :D