Posted by matt on Saturday, April 2, 2011 at 6:47pm.
The windows of a downtown office building are arranged so that each floor has six fewer windows than the floor below it. If the ground floor has 52 windows, how many total windows are on the first eight floors?

math  Henry, Monday, April 4, 2011 at 7:33pm
1St. = 52 Windows.
2nd = 52  6 = 46.
3rd = 46  6 = 40.
4th = 40  6 = 34.
5th = 34  6 = 28.
6th = 28  6 = 22.
7th = 22  6 = 16.
8th = 16  6 = 10.
Total = 52 + 46 + 40 + 34 + 28 + 22 + 16 + 10 = 248 Windows. 
math  Anonymous, Sunday, May 22, 2011 at 5:02pm
What is the sum of a 12–term arithmetic sequence where the last term is 13 and the common difference is –10?