Finite geometric sums

Develop a reliable understanding of finite geometric sums in precalculus. Practice identifying the first term and number of terms, deriving the cancellation formula, and interpreting cumulative totals in repeated-growth models.

Single-select and multiselect questions progress from direct calculations to shifted indexing, reverse problems and error analysis. Worked explanations distinguish a term from a sum and treat ratio-one and zero-ratio cases explicitly. Use exact scratch work before viewing choices; each question stands alone.