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Arithmetic Sequences  Problem 19
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
In order to find any missing terms in an arithmetic sequence, you need to know the common difference, d, that is being added to get from one term to the next in the list. In order to find this, count how many missing terms there are between your two given values, and use those to solve for d. (Lower given number plus so many counted d's equals higher given number.) From there, you can solve for any term number in the list, including the fist, using the arithmetic explicit formula: nth term = first term plus d(n  1).
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
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Find a_{301}. 
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Problem 2 8,836 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
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Problem 3 8,222 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
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Problem 4 7,665 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
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Problem 5 1,442 views 
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Problem 6 1,543 views 
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Problem 7 1,613 views 
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Problem 9 1,256 views 
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Problem 10 1,122 views 
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Problem 11 1,303 views 
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Problem 12 1,130 views 
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Problem 13 1,052 views 
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Problem 14 1,112 views 
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Problem 15 1,077 views 
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Problem 16 1,098 views 
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Problem 17 1,240 views 
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Problem 18 1,059 views 
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Problem 19 1,062 views
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