**Session Date:**2/28/2015 6:33PM ET

**Length:**20.9 minute(s)

**Subject:**Live Math Tutoring - MTH/209

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System Message

[00:00:00] *** Please note: All sessions are recorded for quality control. ***

AUDRA (Customer)

[00:00:00] *** The student has 563 minutes remaining. ***

[00:00:00] sequences

Brook P (Tutor)

[00:00:10] Hi.
Welcome to Tutor.com .
How may I help you today?

AUDRA (Customer)

[00:00:15] File Shared > problem 1.jpg

[00:00:18] Hello

[00:00:26] I attached the first part of the problem im working on

Brook P (Tutor)

[00:00:37] Please give me a moment while I look over the problem you've sent.

AUDRA (Customer)

[00:00:40] NP

[00:01:00] If you'd like to paste it, I can circle which part Im on

Brook P (Tutor)

[00:02:47] Ok.
A geometric sequence is has a common ratio, while a arithmetic sequence has a common difference.
I can write two examples on the board for you.

[00:03:48] So, when you're multiplying or dividing by the same number every time, it's geometric.

[00:04:03] When you're adding or subtracting the same number every time, it's arithmetic.

[00:04:08] Does that make sense?

AUDRA (Customer)

[00:04:47] yes

[00:05:05] so we are subtracting by same #, so it'd be arithmetic?

Brook P (Tutor)

[00:05:13] Yes, good job!

[00:05:47] Do you have any other questions for me today?

AUDRA (Customer)

[00:05:57] yes, let me attach...

Brook P (Tutor)

[00:06:03] Ok

AUDRA (Customer)

[00:07:04] File Shared > problem 1.jpg

[00:07:29] divide by the same # = geometric

Brook P (Tutor)

[00:07:37] You got it!

AUDRA (Customer)

[00:07:50] common ratio

Brook P (Tutor)

[00:08:08] Yep!

[00:08:11]

AUDRA (Customer)

[00:08:28] and the common ratio is..

[00:08:31] 0.2?

[00:08:34] or 0.5?

Brook P (Tutor)

[00:09:08] To figure that out we can take any number in the sequence and divide it by the number that comes before it.

[00:09:22] So, do 1828 divided by 3656.

AUDRA (Customer)

[00:09:38] 0.5

Brook P (Tutor)

[00:09:45] Nice work!

AUDRA (Customer)

[00:11:09] File Shared > problem 1.jpg

[00:11:20] theyre a few to get thru the section if you have the time

Brook P (Tutor)

[00:11:36] Sure.
I can stay on for a bit.

AUDRA (Customer)

[00:11:40] ty

[00:11:54] the common difference is....

[00:12:09] 1, correct?

Brook P (Tutor)

[00:12:23] Take any term in the sequence and subtract the one that comes before it.

[00:12:34] So, do -7 - (-6).

AUDRA (Customer)

[00:13:11] =-13

Brook P (Tutor)

[00:13:32] Not quite.
-7 - (-6) is the same thing as -7 + 6.

AUDRA (Customer)

[00:13:44] -1

Brook P (Tutor)

[00:13:49] Good work!

[00:14:06] It's negative 1 because it's going DOWN by 1.

[00:14:33] It would be 1 if it were going UP by 1.

AUDRA (Customer)

[00:15:10] yes

[00:15:13] here is the next

[00:15:24] File Shared > problem 1.jpg

[00:15:50] common difference/ arithmetic ?

Brook P (Tutor)

[00:16:13] Are you adding or subtracting the same number every time?

AUDRA (Customer)

[00:16:31] oh, common ratio/geometric

Brook P (Tutor)

[00:16:38] Yes!

AUDRA (Customer)

[00:17:02] and the common ratio is -2

Brook P (Tutor)

[00:17:13] Yes!

AUDRA (Customer)

[00:17:45] ok, shld be only 1 more...

Brook P (Tutor)

[00:17:53] Ok

AUDRA (Customer)

[00:18:53] File Shared > problem 1.jpg

[00:19:13] common ratio is ...

[00:19:33] 0.2

Brook P (Tutor)

[00:19:43] You got it!

AUDRA (Customer)

[00:20:18] TY sooo much! You have really helped me understand this!

[00:20:23]

Brook P (Tutor)

[00:20:37] I'm so glad!
You did a great job, too!

AUDRA (Customer)

[00:20:47] TY!

Brook P (Tutor)

[00:20:49] Thanks for using Tutor.com.Â Please fill out the survey as you leave so we can learn how we can better help you in the future!Â Have a great night!