Find an arithmetic sequence whose first term is 5 and common difference is 9.
-5 , -14 , -23, -32....
5, 14,23,32....
-9 , 14,-19, 24...
9 , 14, 19, 24...
The first term of an arithmetic sequence is 5 and the common difference is 2. Find the sum of its first 25 terms.