What is the sum of all the odd integers between 8 and 26?

Find the common difference in the arithmetic sequence 3, 13/4, 7/2, 15/4 , …

If three arithmetic means are inserted between 15 and 55, find the first of these arithmetic means

What is the 7th term of the sequence whose nth term is an = n-3?

Twelve days before Valentine’s Day, Carl decided to give Nicole flowers according to Fibonacci sequence. And so on. On the first day, he sent one red rose, on the second day, two red roses and so on. How many roses did Nicole receive during the tenth day?