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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
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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MegichuBest ResponseYou've already chosen the best response.0
oh wow, thanks for the quick response!
 one year ago

EyadBest ResponseYou've already chosen the best response.1
@timo86m :can u explain how did u get that ?
 one year ago

MegichuBest ResponseYou've already chosen the best response.0
im studying for the SATs and am struggling greatly with permutations
 one year ago

EyadBest ResponseYou've already chosen the best response.1
@Megichu : U know A.Sequence basics ?
 one year ago

timo86mBest ResponseYou've already chosen the best response.0
2+2+2+2...=19*2 =38 25+(19*25)+38
 one year ago

MegichuBest ResponseYou've already chosen the best response.0
i understand what the basic formula is, but interpreting the problem at times can be difficult
 one year ago

EyadBest ResponseYou've already chosen the best response.1
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+(n1)d] where n = number of terms .. now lets fill up the rule S20=20/2 [2*25+(201)2]=880 seats .  Make sense ?
 one year ago

MegichuBest ResponseYou've already chosen the best response.0
perfect. thank you so much for the great response! and yes, that makes much more sense
 one year ago

EyadBest ResponseYou've already chosen the best response.1
Great,Inform me when you need help :)
 one year ago

MegichuBest ResponseYou've already chosen the best response.0
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

MegichuBest ResponseYou've already chosen the best response.0
also, this site is great. i look forward to using it more often!
 one year ago

EyadBest ResponseYou've already chosen the best response.1
Just keep solving examples ,Then it will get much easier :)
 one year ago

MegichuBest ResponseYou've already chosen the best response.0
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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