K12worX
Back to Derive geometric series formula — Problem 2 · Task Set 8

Exercises: Geometric Series Formula

For each problem, identify the parameters a, r, and n before applying any formula. Always check whether r = 1. Show your work for computation problems.

Grade 9·22 problems·~45 min·Common Core Math - HS Algebra·standard·hsa-sse-b-4
Work through problems with immediate feedback
A

Fluency Practice

1.

Find the sum of the geometric series 80+40+20+10+580 + 40 + 20 + 10 + 5.

Use the formula S=a(1−rn)1−rS = \dfrac{a(1 - r^n)}{1 - r}.