HELP WOULD BE MUCH APPRECIATED!

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

a) -143,231
b) -36,047
c) 144,177
d) 716,144

Question

HELP WOULD BE MUCH APPRECIATED!

What is the sum of a 7-term geometric series if the first term is -11, the last term is -45,056, and the common ratio is -4?

a) -143,231
b) -36,047
c) 144,177
d) 716,144

anonymous · Answer

danny what are you doing is this homework

anonymous · Answer

i have like 60 problems and i did most of them exept for these 5 i just posted... i did all i could and im posting these ones on here that i have no idea how to do. sorry. @Jack174

anonymous · Answer

do you go to school with other kids

anonymous · Answer

ya this is algabra 2 second semester summer school the course ends tomorrow and im trying to turn in this last assignment by midnight (8 minutes) @Jack174 i have to take my final tomorrow tooo!!!!

anonymous · Answer

i go to school with other kids... and its online summer school.

anonymous · Answer

wow that sucks, what grade are you in

anonymous · Answer

im a junior going to be a senior next year.

anonymous · Answer

and what were your grades junior year

anonymous · Answer

lol got any plans for life after high school

anonymous · Answer

do you think i could get the answer bro??

anonymous · Answer

is it an online problem?

anonymous · Answer

whats the family business

anonymous · Answer

how long do you have to turn in this homework?

anonymous · Answer

Id help you man, but im really lazy

anonymous · Answer

aww dang bro.

kropot72 · Answer

Use the formula for the sum of n terms as follows:
$$S _{n}=\frac{a(1-r ^{n})}{1-r}$$
$$S _{7}=\frac{-11[1-(-4)^{7}]}{1-(-4)}=you\ can\ calculate$$