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Exactly 18 times
2.0*10^18
18
18
If you count 11 as 2 instances, the digit 1 appears 18 times if you don't count 10, 19 times if you do. 10,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91
Exactly 10 times
Exactly 18 times
8 times
10 x 18 = 180
154 ÷ 18 = 8 remainder 10
can be estimated by comparing their apparent magnitudes. Since brightness decreases with the square of the distance from an observer, a star cluster with main sequence stars one hundredth as bright as the Hyades Cluster would be approximately ten times further away from Earth than the Hyades Cluster.
180,000
4688
18 x 10
2.0*10^18
18
18