Answer:
91%
Step-by-step explanation:
We can use the formula 
- "is" is 90
- "of" is 99
- "percent" is what we are solving for so we will denote it as x
Substituting in our values we get 
- We will need to cross multiply here to get (90)(100) = (x%)(99)
- This simplifies to 9000 = 99x%
- Dividing by 99 on both sides we get 90.9% → x = 91%
I'm more visual, but if you're not, and this confuses you, ask me, and I'll explain it.
Answer:
a) the varying densities are to be considered with respect to position
Step-by-step explanation:
the complete answer is found in the attachment
Answer:
The number of protons is the answer