What is the sum of a 7 term geometric series if the first term is - 11 and the last term is - 45,056, and the common ratio is - 4?

A. - 143,231

B. - 36,047

C. 144,177

D. 716,144

This sequence is:

a (n) = - 11 (-4) ^ (n-1)

The sum of the sequence is:

s (n) = - 11 (1--4^n) / (1--4)

s (n) = - 11 (1--4^n) / 5

so for the first seven terms

s (7) = - 11 (1--4^7) / 5

s (7) = - 11 (1+16384) / 5

s (7) = - 11 (16385) / 5

s (7) = - 36047 B.