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# Bellwork: - PowerPoint PPT Presentation

Bellwork:. Determine whether each of the following is Arithmetic (something was added each time), Geometric ( something was multiplied each time), or Neither -2, -4, -8, -16… 10, 0, -10, -20… 4, 9, 16, 25…. Notation: .

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## PowerPoint Slideshow about 'Bellwork:' - renata

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Presentation Transcript

• Determine whether each of the following is Arithmetic (something was added each time), Geometric (something was multiplied each time), or Neither

• -2, -4, -8, -16…

• 10, 0, -10, -20…

• 4, 9, 16, 25…

• d= common difference (what is added to each term of an arithmetic sequence)

• r= common ratio (what is multiplied to each term of a geometric sequence)

• n= What term number you are looking at (4th term, 10th term… nth term)

The Formula:

Common Difference

nth term

First term

EX: -14, -5, 4, 13, …

becomes

How do we find the 30th term of an arithmetic sequence?

Just plug in 30 for n!

The Formula:

Common Ratio

nth term

First term

EX: 4, 20, 100, 500, …

becomes

How do we find the 10th term of an geometric sequence?

Just plug in 30 for n!