Starting from - 35, add one by one to get a series of integers: - 34, - 33, - 32, - 31 (1) What is the 50th integer in the string? (2) Find the sum of fifty integers The second question is, do you have any formula? If so, please add an explanation,

Starting from - 35, add one by one to get a series of integers: - 34, - 33, - 32, - 31 (1) What is the 50th integer in the string? (2) Find the sum of fifty integers The second question is, do you have any formula? If so, please add an explanation,

(1):14
(2):(-35+14)*50/2=-525