Galaxy a has 5x10^7 stars
Galaxy b has 4x10^9 stars
Choose which galaxy has more stars and how many times more stars than the other galaxy
Galaxy b has more stars than Galaxy a.
To determine how many times more stars Galaxy b has compared to Galaxy a, we divide the number of stars in Galaxy b by the number of stars in Galaxy a:
(4 x 10^9) / (5 x 10^7)
= (4/5) x 10^(9-7)
= 0.8 x 10^2
= 8 x 10^1 (in standard form)
Therefore, Galaxy b has 80 times more stars than Galaxy a.