Answer:
s/2πh =r
Step-by-step explanation:
s=2πrh
Divide both sides by 2πh to isolate r
s/2πh =2πrh /2πh
An atom of sodium has 11 proton, 11 electrons, and 12 neutrons.
Third answer is correct.
hope this helps you.
the answer is r (‑1)/(6*x)-2.1
