Question

81,27,9,3,…
A. Arithmetic,0,-3,-6
B. Geometric,0,-3,-6
C. Geometric,1,1/3,1/9
D. The sequence is neither geometric nor arithmetic.

What are the first four terms of an arithmetic sequence if the common difference is 1.5 and the first term is 15?
A. 15,30,45,60
B. 15,16.5,18,19.5
C. 15,22.5,33.75,50.625
D. none of the above

Answer 1

@Loser66 I have this and 1 more question.

Answer 2

aww ur offline v.v

Answer 3

@OrangeMaster do you know this?

Answer 4

Just give me a second. I've learned this, but I just have to go refresh my memory. :)

Answer 5

Sure thing :)

Answer 6

The first one is C.

Geometric sequences are when you are multiplying or dividing the numbers, and arithmetic sequences are when you are adding or subtracting the numbers.

Answer 7

OOOOOOOOHHHH :D Thanks 4 info!

Answer 8

The second one is B.

This is because it says "difference" this means arithmetic. In 'B' you can see that the next numbers are each having 1.5 added.

Answer 9

:D thanks! I have 1 more question left!

Answer 10

What are the first four terms of a geometric sequence if the common ratio is 10 and the first term is 4.5?
A. 4.5,.45,.045,.0045
B. 4.5,9.0,13.5,18.0
C. 4.5,14.5,24.5,34.5
D. None of the above

Answer 11

Ok, do you want to open it as another question, or do you want to post it here?

Answer 12

Post it here C:

Answer 13

Ok, I'll help you. :)

Answer 14

:D thanks

Answer 15

Is it D?

Answer 16

No, A.

Answer 17

O: It's D though.

Answer 18

I got it wrong, so it's D.

Answer 19

Ok, sorry. Were all the others right.