Question

For problems 1 – 4, solve. You must show your work to receive credit.

1.What is the sum of the geometric sequence 8, –16, 32 … if there are 15 terms? (1 point)

2.What is the sum of the geometric sequence 4, 12, 36 … if there are 9 terms? (1 point)

3.What is the sum of a 6-term geometric sequence if the first term is 11, the last term is –11,264 and the common ratio is –4? (1 point)

4.What is the sum of an 8-term geometric sequence if the first term is 10 and the last term is 781,250? (1 point)
PLEASE HELP!!

Answer 1

so if i give you a direct answer right now you wont benefit from it? haha

Answer 2

i mean i kinda dont have tome to learn i need to turn this in ASAP

Answer 3

time*

Answer 4

you need to identify the common ratio in the sequence 8, -16, 32, ...

Answer 5

then use the formula for the sum of a GP

\[S _{n}= \frac{a(r^n -1)}{(r -1)}\]