Step-by-step explanation:III. SOLVING: Show your solution. (2 points each)A. Find the sum of add numbers from 1 to 100.B. Find the 10 term of the arithmetic sequence 4, 7, 10, 13,C. What is the 9th term of the sequence 9, 18, 367D. What is the sum of the first 8 term of the Geometric sequence 10, 20, 40...?E. What is the sum to infinity if r = 1/5 and a_{1} = 2/3