analyze the given problem. Write and show your solution
1. There are 28 logs in the bottom layer of a pile of logs, 27 in the next layer, 26 in the
next, and so on to the top which has one log. How many logs are in the 15th layer?

2. A new football stadium is to be built. The bottom row will have 250 seats, and each rowabove the bottom row will have 40 seats more than the row in front of it. The designcalls for 30 rows. How many seats will be there in the 30th row? Find the total number of seats.

3. A certain bacterial culture doubles in number every hour. If one bacterium is placed in a glass beaker at 8:00 AM, how many will be there at 12 midnight?