Answer:
-26042
Step-by-step explanation:
sum of a finite geometric series =
[tex]\frac{a_1(1-r^n)}{1-r}[/tex]
here, a1 is the first term, r is the common ratio, and n is the number of terms
a1 = -2
r = -5
n = 7
[tex]\frac{a_1(1-r^n)}{1-r} = \frac{-2(1-(-5)^7)}{1-(-5)} = -26042[/tex]
