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ok

its d/

because it goes up by -7

you mean E?

yea

/lol

thx

An alternating sequence is by definition not arithmetic, and thus must be excluded.

Hold on, there might be other options.....

wait

check all that apply

theres more

can you name some?

Yes, (d=1)

so yes is right

there is a third correct answer
(so far E and C are correct)

8ummmmmm

Yes, A (d=17)

So, A, C & E are sequences that are arithmetic:)

thx

the difference is NOT ALWAYS the same, so for this reason B is NOT arithmetic....

Any questions about anything said in this post?

nosir

i got one more question

Sure:)

The distance of the loop of paper away from the center is the radius, right?

yes

\(a_1\) is the very first radius

\(a_2\) is the second radius

and you need \(a_{85}\) - the 85th radius.

yep

So, lets take a look at the given information.

What is the common difference here?

0.03

Yes, that is correct!

\(\color{black}{\large a_{85}=2.40+{\rm 0.03}\cdot (85-1)}\)
\(\color{black}{\large a_{85}=?}\)

4.92

yes, that is right.
And that means that your 85th radius is 4.92 centimeters.

thx