Posted by sueann on Wednesday, May 30, 2012 at 12:18am.
The first 40 rows of seating in a certain section of a stadium have 25 seats, 28 seats, 31 seats, and so on. The 41st through the 75th rows each contain 125 seats. Find the total number of seats in this stadium section.

Trig  Reiny, Wednesday, May 30, 2012 at 7:18am
For terms from 1 to 40 you have an arithmetic series, where
a = 25, d=2 and n = 40
sum of those seats = (40/2)(2(25) + 39(2) )
= 2560
then there are 35 rows of 125 seats each or 4375 seats
so we have 6935 seats
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