21.) the sum of two consecutive integers is –49. write an equation that models this situation and find the values of the two integers.

a.) n + n + 1 = –49; n = –24; n + 1 = –23

b.) n + n + 1 = –49; n = –25; n + 1 = –26

c.) n + n + 1 = –49; n = –25; n + 1 = –24

d.) n + 2n = –49; n = –17; 2n = –34