Common Core: High School - Algebra : Derive the Sum of a Finite Geometric Series Formula to Solve Problems: CCSS.Math.Content.HSA-SSE.B.4

Study concepts, example questions & explanations for Common Core: High School - Algebra

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All Common Core: High School - Algebra Resources

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Example Questions

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Example Question #71 : Seeing Structure In Expressions

1, 9, 81, 729, 6561...

 

Is the sequence above arithmetic, geometric, or neither?

Possible Answers:

Geometric

Neither

Arithmetic

Correct answer:

Geometric

Explanation:

The series is geometric, which means that to get from one value to the next you always multiply by the same value. Here to get from one value to the next, you multiply by 9 each time:

 

1 x 9 = 9

9 x 9 = 81

81 x 9 = 729

729 x 9 = 6561

Example Question #72 : High School: Algebra

What type of sequence describes the following set of numbers?

 

3, 15, 75, 375, 1875

Possible Answers:

Geometric Series

Unknown Series

Arithmetic Series

Correct answer:

Geometric Series

Explanation:

This is a geometric series. The same value, 5, is multiplied by each value to get to the next:

3 x 5 = 15

15 x 5 = 75

75 x 5 = 375

375 x 5 = 1875

 

When each term in a series is equal to the previous term multiplied by the same factor - in this case 5 - that's a geometric series.

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All Common Core: High School - Algebra Resources

8 Diagnostic Tests 97 Practice Tests Question of the Day Flashcards Learn by Concept
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