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Mathematics

9th

grade

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Arithmetic Sequence and Summation Notation

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20 questions

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  • 1. Multiple Choice
    1 minute
    1 pt

    Which of the following is an example of an arithmetic sequence?

    1, 1, 2, 3, 5...

    15, 20, 26, 33...

    84, 73, 62, 51...

    1, 10, 100, 1000...

  • 2. Multiple Choice
    5 minutes
    1 pt

    What is the common difference of the arithmetic sequence with a 3rd term of 22 and 16th term of 100?

    6

    10

    4

    8

  • 3. Multiple Choice
    5 minutes
    1 pt

    What is the RECURSIVE formula for an arithmetic sequence with  a8=41a_8=41  and  a11=56a_{11}=56  ?

     a1=5; an=an1+6  for  n2a_1=5;\ a_n=a_{n-1}+6\ \ for\ \ n\ge2  

     a1=1; an=an1+5  for  n2a_1=1;\ a_n=a_{n-1}+5\ \ for\ \ n\ge2  

     a1=6; an=an1+5  for  n2a_1=6;\ a_n=a_{n-1}+5\ \ for\ \ n\ge2  

     a8=41; an=an1+15  for  n2a_8=41;\ a_n=a_{n-1}+15\ \ for\ \ n\ge2  

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