# Tutor.com Exponential and Logarithmic Functions Session

##### Jan. 24, 2013

Session Transcript - Math - Algebra II, 1/16/2013 11:10PM - Tutor.comSession Date: 1/16/2013 11:10PM
Length: 14.4 minute(s)
Subject: Math - Algebra II

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

Guest (Customer)
[00:00:00] Expand the right side of the formula. The pH of a patient's blood can be calculated using the Henderson-Hasselbach Formula, pH=6.1+log^B/C, where Bis the concentration of bicarbonate and C is the concentration of carbonic acid. The normal pH of blood is approximately 7.4.

Bill P (Tutor)
[00:00:22] hello!

Guest (Customer)
[00:00:33] hi

Bill P (Tutor)
[00:00:37] Can you give me a moment while I take a look at your question?

Guest (Customer)
[00:00:55] Take all of the time you need. How long is the tutoring service offered tonight?

Bill P (Tutor)
[00:01:25] I think you can find a tutor pretty much 24/7

Guest (Customer)
[00:01:44] Wow. That's awesome.

Bill P (Tutor)
[00:02:02] heck yeah!
[00:02:20] OK, let me re-write the expression on the board
[00:03:11] and we are asked to expend the right side. Is that all?

Guest (Customer)
[00:03:22] I believe it is.

Bill P (Tutor)
[00:03:53] OK, to expand the expression we need to know about properties of logs

Guest (Customer)
[00:04:03] Okay.

Bill P (Tutor)
[00:04:04] are you familiar?

Guest (Customer)
[00:04:22] I know a few. Is this the one where we expand the expression?

Bill P (Tutor)
[00:04:46] yes, it is usually called the quotient property of logs
[00:05:13] I'll write the property on the board for us
[00:06:11] have you seen that before?

Guest (Customer)
[00:06:44] yes!
[00:06:46] I have.

Bill P (Tutor)
[00:07:06] well we use that property applied to the expression we were given
[00:07:18] think you can write it on the board?

Guest (Customer)
[00:08:17] You want me to apply it to the problem?

Bill P (Tutor)
[00:08:35] yes, the part that says log(B/C)

Guest (Customer)
[00:08:45] Sure

Bill P (Tutor)
[00:08:50] expand that part of the expression

Guest (Customer)
[00:09:15] Can I get a little bit more space? i tend to write largely on the whiteboard

Bill P (Tutor)
[00:09:26] sure

Guest (Customer)
[00:12:03] I'm finished.
[00:12:07] What is the next step?

Bill P (Tutor)
[00:12:30] Yes, that is it! We cannot expand the expression any more

Guest (Customer)
[00:12:37] Wow!
[00:12:40] Thank you.\

Bill P (Tutor)