Newtons laws/weight/acceleration/force

[lilkiddykid4]

Homework Statement

Please help I'm terrible with physics =[

1) If r is the radius of the Earth, how far above the surface of the Earth would you have to go so that your true weight is one-fourth of what it is on the surface of the Earth?

a) r
b) 2r
c) 3r
d) 4r

The only formulas I was given are in the attachment

Also I need help another question also in the attachment. Sorry if the picture is blurry that's the best I could make it. 1) For the first question my intuition tells me its 4 but I'm not 100% sure.
2) I am literally clueless for the second one

 

[Spinnor]

See,

http://faculty.eicc.edu/tgibbons/psrweightless.htm

From,

https://www.google.com/webhp?hl=en#...b15419fa31a4bb&bpcl=38625945&biw=1093&bih=491