A quick overview of how many RP you gain with every Kill/Placement/Rank combination : r/apexlegends
Respawn reveals first details on Apex Legends' ranked mode - Polygon
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Apex Legends Season 18 Ranked Changes Revealed
Ranked changes infographic for those of you who want to read the in-game info changes from afar at work. Participation points = 50% RP credit so long as your team gets kills