Identifying and writing sequences

What are arithmetic sequences?

• Arithmetic sequences are sequences where you add or subtract the same number to get the next term.

• Arithmetic Sequences are sequences where you are multiplying or dividing by the same number to get the next term.

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CCSS.HSF.BF.A.2

What kind of sequence is illustrated below?
 400, 200, 100, 50, 25, ...

• Arithmetic
• Geometric
• Neither

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CCSS.HSF.BF.A.2

Which of the following is explicit?

• $f_n=4n+5$

•  $f_n=5f_{n-1}$  

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CCSS.HSF.BF.A.2

Determine whether the sequence is arithmetic, geometric, or neither.

• arithmetic
• geometric
• neither

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CCSS.HSF.BF.A.2

What number follows 20 in this arithmetic sequence?

8,11, 14, 17, 20

• 5

• 23

• 26

• 29

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CCSS.HSF.BF.A.2

In a geometric sequence, if a1 = 3 and r = 2, what is the value of a6?

• 96

• 48

• 192

• 64

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CCSS.HSF.BF.A.2

Find the 16th term of the sequence 1, 5, 9, 13, ...

• 60

• 61

• 64

• 65

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CCSS.HSF.BF.A.2

An arithmetic sequence is given below.

2, 9, 16, 23, ...

Which is the explicit formula for the n^th term a_n?

(Look at the choices carefully! You may have to simplify your equation to get the correct choice!)

• a_n = -7n+9

• a_n = 7n-5

• a_n = 7n-9

• a_n = -7n+5

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CCSS.HSF.BF.A.2

Which number is missing in this pattern? 
62, 68, 76, 82, 90, 96 ___, 110

• 102
• 106
• 104
• I don't know

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CCSS.HSF.BF.A.2

Which of the following is NOT a geometric sequence?

• 6,18,54,162

• 14,28,42,56

• 2,18,162,1458

• 8,24,72,216

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CCSS.HSF.BF.A.2