Homework Help: arithmetic

Posted by soka on Saturday, August 6, 2011 at 2:56pm.

PLEASE I REALLY NEED HELP WITH THIS

The seats at a local baseball stadium are arranged so that each row has five more seats than the row in front of it. If there are four seats in the first row, how many total seats are in the first 24 rows?

arithmetic - bobpursley, Saturday, August 6, 2011 at 3:11pm
it is an arithmetic series, with distance 5, and you want the sum of n=24 rows.

Sum=n/2 (a1+an)

where an=a1+d(n-1)
an=4+5(23)=119 check that
sum=24/2 (123)=12*123

check all that. http://www.purplemath.com/modules/series4.htm

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