Question

help

Answer 1

a geometric sequence has a term of \[a_{4}=-54\] and a common ratio of r=3. what is the rule of the nth term?

Answer 2

@Data_LG2

Answer 3

do you want me to write the answers?

Answer 4

\( \sf \Large a_n = a_1 r^{n-1}\)

Answer 5

okay (:

Answer 6

okay, write the choices so that we can which one is the right one

Answer 7

*choose

Answer 8

well i think its b cause it looks like the one you set up, ill show you

Answer 9

oh lol that's the general rule for geometric sequence

Answer 10

\[a _{n}=-2\times3^{n-1}\]

Answer 11

oh xD

Answer 12

\(\sf \Large a_n = a_1 r^{n-1}\\-54=a_1(3)^{4-1}\\\Large a_1=\frac{-54}{3^{4-1}}\)
to determine the general formula for the nth term we have to find the first term \(\sf a_1\) by evaluating the formula..
so what you willl get for \(\sf a_1\) ?

Answer 13

no idea

Answer 14

what is \(3^{4-1}=3^3\) equal to ?

Answer 15

27? lol idk

Answer 16

yes , -54 divided by 27 ?

Answer 17

-2

Answer 18

right so \(\sf a_1 =-2 \)
which means that choice is right ^_^

Answer 19

thanks (:

Answer 20

no problem

Answer 21

what about this one ,
identify which of the sequences below is a geometric sequence?

a. 2,4,6,8

b. 3,6,18,54

c. 2,6,18,54

d. 2,6,18,36

Answer 22

i think its a

Answer 23

or is that an arithmetic sequence?