Question about Casio FX-300MS Calculator

# Find log(1-.2) Please find log(1-.2)

Posted by on

### Anonymous

• Level 2:

An expert who has achieved level 2 by getting 100 points

MVP:

An expert that gotĀ 5 achievements.

Vice President:

An expert whose answer gotĀ voted for 100 times.

Sniper:

An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.

• Expert

I don't get it but here some help with logs:
log x base y = log x / log y (when log x is default base 10 in calculators) and
log (x*y) = log x + log y
log (x/y) = log x - log y
the bases is default 10
hope it's helped

Posted on Jul 06, 2009

×

my-video-file.mp4

Complete. Click "Add" to insert your video.

×

## Related Questions:

### There appears to be a screw up inside where the filter holder goes that won't allow the filter holder to be turned! Is it defective or am I doing something wrong??

U.S. Residents:
Please contact toll free hotline at 1-800-322-3848 or log onto website at www.delonghi.com.
For all accessories, spare parts or replacement parts, please contact parts division at 1-800-865-6330.
Please contact toll free hotline at 1-888-335-6644 or log onto website at www.delonghi.com.

Jul 08, 2014 | DeLonghi EC155 Espresso Machine

### Hwk authentication stage error no more upgrade logs

Mar 22, 2013 | Cell Phones

### When I go to use the 'log' button on TI 30XA I do not come up with the same answer as in my course book (for the examples) No real instructions on logs in the little instruction book. Have tried...

You calculate the pH with the relation
pH=-log(c) where c is the value of concentration in mol/L.
ex: c[H+]= 3.57x10^(-6)
pH: (-) [LOG] 3.57 [2nd][EE] [(-)] 6 [ ) ]
Here you have 2 change sign key press [(-)]

If you have the pH, and want to calculate the concentration that yields that value of the pH you proceed as follows
c= 10^(-pH)
Ex pH=8.23
c: [2nd][LOG] [(-) 8.23 [)]

General shortcut.
If concentration is of the form c[H+]= 1*10^(-a) where a is an integer between 0 and 14, the pH is equal to the positive value of exponent.

Ex:c[H+]=1x10^(-5) Mol/L then the pH is just the positive value of the exponent, ie 5 because pH=-log(1.x10^-5) =- log1 -log(10^-5)=0 -(-5)=5
Above I use the rule log(axb)=log(a)+log(b) , the rule log(a^b) = b*log(a)and the facts that log(1)=0 and log(10)=1, the last being true if log stands for log in base 10.

May 17, 2011 | Texas Instruments TI-30XA Calculator

### My calculator is giving me the wrong answers for the Log^-1. I keep on pressing SHIFT then the Log and the anti- log keeps on coming up as 10^. Before it would appear on the screen as Log^-1 ( ). Please...

Sorry the answer comes too late for your final exam. If you took the time to really understand what the inverse of a log function is, you would have saved yourself the anxiety before the test.

Anyway, the inverse of the logarithm in base 10 IS the power function with base 10.
y=log(x) <=> x=10^(y).

Some calculator manufacturers use the marking ^-1 to represent an inverse function. But recently one sees new calculators with the new notation.

By the way, the inverse of the natural log function (LN) is the exponential function (e^(x))

May 02, 2011 | Casio fx-300ES Calculator

### I have a Texas Instruments BAII Plus Professional Calculator. In the course I'm in, I need to know how to calculate the following formula = 1 + 3.3 log (n) The problem is that I can't figure out how to...

Pressing 2 0 0 LN = will give you the natural logarithm of 200. If you need the common (base 10) logarithm, divide the result by the log of 10.

( 2 0 0 LN ) / ( 1 0 LN ) =
will give you the common log of 200.

Jan 05, 2011 | Texas Instruments BA-II Plus Calculator

### Log^-1(11/20) please solve step by step.

Assuming you want the common antilog of 11/20:
2nd 10^x 1 1 / 2 0 ENTER

10^x is on the LOG key, to the left of the 7 key.

Nov 15, 2010 | Texas Instruments TI-83 Plus Calculator

### Guys i need to get an inverse log the same as log-1 ou know how?

Hello

When you talk about the natural logarithms [LN], the inverse of the log is the exponential

ln (exp(x))=exp(ln(x)) =x
but with othe logarithms, thinhs are different
Let us take

y=10^(x)

then with log standing as usual for log in base 10 take the log of both members in the above equality

log(y) =log{10^(x)) = x* log(10) : this is a property of the log function.
However, log(10) =1 This is also a property of the log

Gathering results, we end up with the new equality
log(y)=x or x=log(y)

Without entering into extraneous details that mathematicians adore, we can state that there is an equivalenve between y=10^(x) and x=log(y)

y=10^(x) <-->x=log(y) where <--> means implication in both directions.

Here is a screen capture from another calculator to convinve you. Your calculator cannot do that.

Hope it helps.

Oct 06, 2009 | Texas Instruments TI-30 XIIS Calculator

### Dear Sir, my pc has an unremovable worm called RAILA ODINGA i will be glade if you can help me sir.

1. Save " HJTInstall.exe" to your desktop.
2. Double click on HJTInstall.exe to run the program.
3. By default it will install to C:Program FilesTrend MicroHijackThis.
4. Accept the license agreement by clicking the "I Accept" button.
5.Click on the "Do a system scan and save a log file" button. It will scan and then ask you to save the log.
6. Click "Save log" to save the log file and then the log will open in Notepad.
7. Click on "Edit > Select All" then click on "Edit > Copy" to copy the entire contents of the log.
9. Do NOT have HijackThis fix anything yet! Most of what it finds will be harmless or even required.
!!!! Only run option #1 as runing the other options on an uninfected computer will damage the desktop.!!!!

Open the "SmitfraudFix" folder and double-click "smitfraudfix.cmd"
Select option #1 - Search by typing 1 and press "Enter"; a text file will appear, which lists infected files (if present).
Please copy/paste the content of that report into your next reply.
Note: process.exe is detected by some antivirus programs (AntiVir, Dr.Web,Kaspersky) as a "RiskTool"; it is not a virus, but a program used tostop system processes. Antivirus programs cannot distinguish between"good" and "malicious" use of such programs, therefore they may alertthe user.

Jan 27, 2009 | Computers & Internet

#### Related Topics:

453 people viewed this question

## Ask a Question

Usually answered in minutes!

Level 3 Expert

Level 3 Expert