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Megichu

  • 2 years ago

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?

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  1. timo86m
    • 2 years ago
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    25+(x*2)

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

  3. timo86m
    • 2 years ago
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    not finished

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

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

  6. Megichu
    • 2 years ago
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    sequences*

  7. Eyad
    • 2 years ago
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    @Megichu : U know A.Sequence basics ?

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

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

  10. timo86m
    • 2 years ago
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    |dw:1342034133001:dw|

  11. Eyad
    • 2 years ago
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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 ?

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

  13. Eyad
    • 2 years ago
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    Great,Inform me when you need help :)

  14. Megichu
    • 2 years ago
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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

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

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

  17. Megichu
    • 2 years ago
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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

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