Question

What type of sequence is this: 4, 6, 8, 10…?

Answer 1

do you have to find the rule or something?

Answer 2

no this is my only information! sorry!:(

Answer 3

This is the same question as the one before?

Answer 4

Arithmetic sequence

Answer 5

no its not

Answer 6

the same question

Answer 7

http://openstudy.com/users/lovelychick13#/updates/53597a49e4b0fb65c3cab365
"What type of sequence is this: 4, 6, 8, 10…?"
I think you posted the wrong one then, unless I've gone crazy. :p

Answer 8

OH.... I DID!!! awww...

Answer 9

What is the 20th term of the geometric sequence that starts with .02 and has a ratio of 2?

Answer 10

Our first term is .02. We multiply by our common ratio of 2 to get the second term.
0.02 * 2^1 = 2nd term
For the 3rd term, multiply by 2 again:
0.02 * 2^2 = 3rd time
Notice the pattern is thus, the n-th term is our initial term multiplied by the common ratio to the n-1 power:
n-th term = 0.02 * 2^(n-1)

We want the 20th, so just use that formula: 0.02 * 2^(20-1)

Answer 11

ok...got .76

Answer 12

Just 0.76?

Answer 13

ya why? is that wrong?

Answer 14

Oh I see, you multiplied:
0.02 * 2 * 19
The caret symbol I used (^) means an exponent:
0.02 * 2^(n-1) 0.02*2^(20-1)
\( 0.02 * 2^{n-1} \) \(0.02 * 2^{20-1} \)

Answer 15

wha does * mean?

Answer 16

Because for a geometric sequence, it is repeated multiplication. It is more convenient to write it as an exponent, though.

Answer 17

multiplication, like x or a dot.
Sorry, I use a notation that I find more convenient to me. The same thing with a dot or multiplication sign is:
\( 0.02 \times 2^{n-1} \) \( 0.02 \cdot 2^{n-1} \)

Answer 18

I see! ok so my calculator cant do that...

Answer 19

What kind of calculator is it?
Usually it is a key like \(x^y\) or if it is graphing calculator, it might just be a caret symbol ^

Answer 20

oh I have it!! ok .04

Answer 21

I think that's only 0.02 * 2
If you use the key, you type your exponent afterwards so that your operations would be:
0.02 (multiply) 2 (exponent) (19)

Answer 22

;( ummm....

Answer 23

Google calculator gives the answer 10485.76 https://www.google.com/#q=0.02*2%5E19
(The 0.76 confused me earlier from that)

Answer 24

thanx!!!!!!!

Answer 25

Glad to help! :)