Question

HELP!!

Answer 1

Which of the following is the formula for this geometric sequence?
1, -3, 9, -27,...
Answer

an = -1(3)n-1

an = 1(-3)n-1

an = 3(-1)n-1

Answer 2

which sequence gives the right values when n=1,2,3,4,

Answer 3

i dont know @UnkleRhaukus

Answer 4

lets try the first one

\[a_n = -1(3)^{n-1}\]

for n=1

\[a_1 = -1(3)^{1-1}=\,\dots\]

Answer 5

no clue :/

Answer 6

what you mean by all this :/

Answer 7

try simplify it a bit at a time

1-1=?

Answer 8

0

Answer 9

so now we have

\[a_1=−1(3)^0 = \]


do you know what any* number to the power zero equals ?

almost any*

Answer 10

i think always 0

Answer 11

a number to the power zeor equals one