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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.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
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Sample Problems (19)
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Problem 3 7,519 viewsGiven a_{11} = 52, a_{19} = 92,
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Problem 4 7,058 viewsFind the number of terms:
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Problem 6 1,193 views 
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Problem 7 934 views 
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Problem 12 777 views 
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Problem 13 748 views 
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Problem 14 752 views 
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Problem 15 748 views 
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Problem 16 780 views 
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Problem 17 752 views 
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Problem 18 739 views 
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Problem 19 715 views
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