Ra is the roughness of the surface used in engineering. Mu(greek letter)metres is one millionth of a metre. To put in perspective glass would be around Ra 0.1, polished chrome plating would be around Ra 0.3 so Ra 0.8 is still fairly smooth but a dull finish. You would just be able to feel the surface with your fingernail.
42
Yes.
m = 24
m = n/(n-1)
M = mass
4 m
M. Ageyev was born on 1898-08-08.
42
m+m when m equals 2. 2+2 4
Yes.
4!
Joseph M. Clary died on 1996-08-08.
M. G. Radhakrishnan was born on 1940-08-08.
William M. Callaghan was born on 1897-08-08.
Anastasia M. Ashman was born on 1964-08-08.
m = 24
m = n/(n-1)