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.