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Megichu

the front row of a stadium has 25 seats. each of the other rows has two more seats than the row in front of it. how many seats are there altogether in the first 20 rows?

  • one year ago
  • one year ago

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  1. timo86m
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    25+(x*2)

    • one year ago
  2. Megichu
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    oh wow, thanks for the quick response!

    • one year ago
  3. timo86m
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    not finished

    • one year ago
  4. Eyad
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    @timo86m :can u explain how did u get that ?

    • one year ago
  5. Megichu
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    im studying for the SATs and am struggling greatly with permutations

    • one year ago
  6. Megichu
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    sequences*

    • one year ago
  7. Eyad
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    @Megichu : U know A.Sequence basics ?

    • one year ago
  8. timo86m
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    2+2+2+2...=19*2 =38 25+(19*25)+38

    • one year ago
  9. Megichu
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    i understand what the basic formula is, but interpreting the problem at times can be difficult

    • one year ago
  10. timo86m
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    |dw:1342034133001:dw|

    • one year ago
  11. Eyad
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    Front row=a=first term=25. Each of the other rows has two more seats than the row in front of it ,thats mean that the difference between every two rows is 2 ,So d=2 ========================= a=25 ,d=2 Sum law : Sn=n/2[2a+(n-1)d] where n = number of terms .. now lets fill up the rule S20=20/2 [2*25+(20-1)2]=880 seats . ------------------------------------------------------------- Make sense ?

    • one year ago
  12. Megichu
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    perfect. thank you so much for the great response! and yes, that makes much more sense

    • one year ago
  13. Eyad
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    Great,Inform me when you need help :)

    • one year ago
  14. Megichu
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    not sure why i have such a difficult time with these problems (considering that their are 2 main formulas XD) but i really appreciate the help

    • one year ago
  15. Megichu
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    also, this site is great. i look forward to using it more often!

    • one year ago
  16. Eyad
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    Just keep solving examples ,Then it will get much easier :)

    • one year ago
  17. Megichu
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    definitely doing a lot of that right now! haha im taking an SAT course right now and have a packet to practice all of these lovely problems :3

    • one year ago
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