I'm so confused on these two problems. If you could help at all I would really appreciate it. Thanks!
You can find some estimates by trial and error.
Consider
We know that and as 15 is between 8 and 16 then x must be between 3 and 4, probably closer to 4.
It now depends on how accuarate you want to be.
Do the same for , the answer should be between 1 and 2.