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# Unit 6: Get ready for series

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## About this unit

How do you add up infinitely many numbers? What patterns can you find in sequences of fractions, decimals, or powers? These articles, activities, and videos will get you practicing using formulas, notation, and graphs, and prepare you for working with sequences and series in precalculus and calculus.

### Learn

### Practice

- Use arithmetic sequence formulasGet 5 of 7 questions to level up!
- Use geometric sequence formulasGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

### Learn

### Practice

- Recursive formulas for arithmetic sequencesGet 3 of 4 questions to level up!
- Explicit formulas for arithmetic sequencesGet 3 of 4 questions to level up!
- Converting recursive & explicit forms of arithmetic sequencesGet 3 of 4 questions to level up!

### Learn

### Practice

- Recursive formulas for geometric sequencesGet 3 of 4 questions to level up!
- Explicit formulas for geometric sequencesGet 3 of 4 questions to level up!
- Converting recursive & explicit forms of geometric sequencesGet 3 of 4 questions to level up!

### Practice

- Sequences word problemsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 560 Mastery points

### Practice

- Evaluate sequences in recursive formGet 3 of 4 questions to level up!

### Learn

### Practice

- Geometric series formulaGet 3 of 4 questions to level up!
- Finite geometric series word problemsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

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Level up on all the skills in this unit and collect up to 1,200 Mastery points!