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anonymous

  • one year ago

the third term of an arithmetic is 21, and the eigth term is 56. the first term is...

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  1. anonymous
    • one year ago
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    2 equations 21=a+2d 56=a+7d

  2. anonymous
    • one year ago
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    use this for more reference . i am busy sorry contact me for help though ....XD http://openstudy.com/study#/updates/504cef62e4b02980ad8101c4

  3. anonymous
    • one year ago
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    the first term is 7

  4. anonymous
    • one year ago
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    @trina1478

  5. anonymous
    • one year ago
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    yes

  6. SolomonZelman
    • one year ago
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    lets get a notation and everything I will denote (that all mathematicians denote) straight. notation read as meaning \(\large\color{black}{ \displaystyle a_1 }\) a of 1 the first term in a sequence \(\large\color{black}{ \displaystyle a_2 }\) a of 2 the second term in a sequence \(\large\color{black}{ \displaystyle a_3 }\) a of 3 the third term in a sequence and so forth... and IN GENERAL. \(\large\color{black}{ \displaystyle a_n }\) a of n any \(\rm n\) th term in a sequence

  7. SolomonZelman
    • one year ago
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    Now, in arithmetic sequence, all terms follow a certain pattern. You always add or subtract the same number to get to the next term. We refer to this number that you add or subtract (in an arithmetic sequence, to get to the next term) using a letter "d" (because it id the \(\rm d\)ifference between the terms)

  8. anonymous
    • one year ago
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    gice me medal i answered correctly

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