Answer:
The spectral types and sub-classes represent a temperature sequence, from hotter (O stars) to cooler (M stars), and from hotter (subclass 0) to cooler (subclass 9). The temperature defines the star's "color" and surface brightness. ... Stars are also classified by luminosity class.
Explanation:
Answer would be True since Russia became Communist in 1917.
First turn 18% to a decimal, which is .18, then multiply it by 450.
450 x .18 = 81
