anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
25+(x*2)
anonymous
  • anonymous
oh wow, thanks for the quick response!
anonymous
  • anonymous
not finished

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anonymous
  • anonymous
@timo86m :can u explain how did u get that ?
anonymous
  • anonymous
im studying for the SATs and am struggling greatly with permutations
anonymous
  • anonymous
sequences*
anonymous
  • anonymous
@Megichu : U know A.Sequence basics ?
anonymous
  • anonymous
2+2+2+2...=19*2 =38 25+(19*25)+38
anonymous
  • anonymous
i understand what the basic formula is, but interpreting the problem at times can be difficult
anonymous
  • anonymous
|dw:1342034133001:dw|
anonymous
  • anonymous
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 ?
anonymous
  • anonymous
perfect. thank you so much for the great response! and yes, that makes much more sense
anonymous
  • anonymous
Great,Inform me when you need help :)
anonymous
  • anonymous
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
anonymous
  • anonymous
also, this site is great. i look forward to using it more often!
anonymous
  • anonymous
Just keep solving examples ,Then it will get much easier :)
anonymous
  • anonymous
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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