Answer:
Step-by-step explanation:
This is arithmetic series
first term (a) = -1976
common difference = 2nd term - 1st term
= (-1669) - (-1676)
=(-1669) + 1676
d = 7
nth term = a + (n-1)d
(-1676) + (n-1) 7 = (-108)
(-1676) + 7n - 7 = (-108)
-1683 + 7n = -108
7n = -108 + 1683
7n = 1575
n = 1575/7
n = 225
last term (l) = -108
sum = n/2(a + l)
[tex]=\frac{225}{2}*[(-1676)+(-108)]\\\\=\frac{225}{2}*[-1784]\\\\=225*[-892]\\\\=[-200700][/tex]
