SOLUTION: A field house has a section where the seating can be arranged so the first row has 9 seats, the second row has 11 seats, the third row has 13 seats and so on. If there is sufficien
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Question 1082361: A field house has a section where the seating can be arranged so the first row has 9 seats, the second row has 11 seats, the third row has 13 seats and so on. If there is sufficient space for 26 rows in the section, how many seats are in the last row of the section?
Answer by ikleyn(52786) (Show Source): You can put this solution on YOUR website!
.
9 + 25*2 = 59.
It is an arithmetic progression/sequence with the first term 9 and the common difference of 2.
They ask you about the 26-th term of the progression.
There is a bunch of introductory lessons on arithmetic progressions in this site:
- Arithmetic progressions
- The proofs of the formulas for arithmetic progressions
- Problems on arithmetic progressions
- Word problems on arithmetic progressions
Also, you have this free of charge online textbook in ALGEBRA-II in this site
- ALGEBRA-II - YOUR ONLINE TEXTBOOK.
The referred lessons are the part of this online textbook under the topic "Arithmetic progressions".
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