Choosing resistor values for a 555 timer
[1]Theoretically YES.
Practically there are some constraints like:
* You cannot realize every other resistance value. However, ratios(as in your case) can be realized to a good degree of accuracy.
* The 555 internal circuitry exhibits some finite delay which limits the max freq in astable mode.    

Datasheets do contain the tricky information's about such limits.

[2]
Nope!
Your R1 + R2 should be around 142k for the required High_time of 0.1 sec.
But the fall time 0.011 sec requires R2 around 15.7k.
So that's the theory, now the trouble is practically finding those resistance values.
Good luck!