Delayed retrieval and prerequisite connections

Return to vectors, complex geometry, polar coordinates and spatial reasoning after intervening study. This delayed-retrieval set contains new item families, with six module-focused tasks and six connections to earlier algebra, trigonometry, units and logical reasoning. Problems are mixed rather than sequenced by difficulty, and each can be solved independently. Attempt them without reviewing worked examples first; then use the detailed explanations to identify specific gaps. This is an extension-level learning check, not a placement test, automatic schedule or certified mastery measure.