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- anonymous

The first four terms of a sequence are shown below:
7, 4, 1, -2
Which of the following functions best defines this sequence?

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- anonymous

- katieb

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- anonymous

i will give a gold medal

- freckles

well I would check to see if it was arithmetic sequence first :
do you have term-previous term=same number
like I mean are all the following equal:
4-7=?
1-4=?
-2-1=?

- anonymous

hold up let me put the answeres in

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- anonymous

it wont let me copy and paste them in

- anonymous

anyone?

- freckles

well I asked you a question and you haven't answered yet
so I don't know if you mean me or someone else because you don't understand what I'm asking you?

- freckles

I'm asking you if all the differences are the same above
4-7=?
1-4=?
-2-1=?

- freckles

if we can establish all of these are the same then we have an arithmetic sequence and that means we have a common difference

- freckles

\[a_n=a_1+d(n-1)\]
d represents the common difference if there is one
So I'm still asking you the following questions:
4-7=?
1-4=?
-2-1=?

- anonymous

i

- anonymous

i have no idea what im doing lol

- freckles

So you haven't done subtraction yet?

- freckles

|dw:1438708092263:dw|
do you want to try doing 1-4=?
and -2-1=?

- freckles

Come on... you have to know subtraction to know how to do this problem.
You know 1-4 and -2-1 and 4-7 all have the same difference which is -3
-3 is your common difference
you do have an arithmetic sequence
use the equation I gave you above for a_n

- anonymous

sorry
computer turned off

- anonymous

its -4

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