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anonymous

  • one year ago

medal Find the sum of the summation of 2 i minus 9, from i equals 3 to 10

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  1. anonymous
    • one year ago
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    answer choices 52 26 13 32

  2. anonymous
    • one year ago
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    so u need help?

  3. anonymous
    • one year ago
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    there

  4. anonymous
    • one year ago
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    what

  5. ybarrap
    • one year ago
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    Is this the problem? $$ \Large{ \sum_{i=3}^{10}\left ( 2i-9\right ) } $$ If so, let's rearrange indices so that i starts at zero and simplify: $$ \Large{ \sum_{i=0}^{7}\left ( 2(i+3)-9\right )=\sum_{i=0}^{7}\left ( 2i+6-9\right )\\ =\sum_{i=0}^{7}\left ( 2i-3\right )=\left (2\sum_{i=0}^{7}i\right )-3\times 8 } $$ Does this make sense? Can you finish?

  6. anonymous
    • one year ago
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    32

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