E. Find the sum of each arithmetic sequence. (Use extra sheet to show your process) 1. 2, 5, 8,... to 8 terms 2. 3, 6, 9,... to 15 terms 3.-12, -6, 0,... to 12 terms 4. Sum of even integers from 10 to 90 5. Sum of integers between 6 and 30​