Question

I do not understand how to do one of my online homework questions:

Answer 1

Just plug in the figures: 

R = 2GM/c^2 
= (2)(6.67*10^-11)(100*10^6*2*10^30) / (9*10^16) 
= 3*10^11 m 
= 3*10^8 km 
= 3*10^2 million km 
= 300 million km