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- 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?

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- anonymous

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- anonymous

25+(x*2)

- anonymous

oh wow, thanks for the quick response!

- anonymous

not finished

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- anonymous

@timo86m :can u explain how did u get that ?

- anonymous

im studying for the SATs and am struggling greatly with permutations

- anonymous

sequences*

- anonymous

@Megichu : U know A.Sequence basics ?

- anonymous

2+2+2+2...=19*2 =38
25+(19*25)+38

- anonymous

i understand what the basic formula is, but interpreting the problem at times can be difficult

- anonymous

|dw:1342034133001:dw|

- 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

perfect. thank you so much for the great response! and yes, that makes much more sense

- anonymous

Great,Inform me when you need help :)

- 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

also, this site is great. i look forward to using it more often!

- anonymous

Just keep solving examples ,Then it will get much easier :)

- 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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