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-logka=4.7 calculate

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Log (k_a)=-4.7
-log(k_a)=4.7
-log(k_a)=0 - log(k_a)=log(1)-log (k_a)=
=log(1/k_a)=4.7
Raise both members of the last equality to the power of 10
10^(log(1/k_a))=1/k_a=10^(4.7)
k_a=10^(-4.7)=1.99526*10^(-5)

Posted on Mar 23, 2014

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2 Answers

4.7=-logka


I assume you mean
b6f99112-cd6a-4c9f-8af0-ec0b8fcf8cf0.gif
This equation contains two unknowns: k and a, so I cannot give you a numeric result, nor can a calculator. However, you can express k as a function of a, or a as a function of k:
9ce61ef1-5d84-4b18-a7fb-45253bbf5e1d.gif

where ln is the natural logarithm base e=2.712818...

Mar 22, 2014 | Casio FX-115MS Plus Calculator

2 Answers

1/1*2+1/2*4+1/2*4*6


According to the operation priority rules
1/1*2=1*2=2
1/2*4=(1/2)*4=2
1/2*4*6=(1/2)*4*6=12
The result is 2+2+12=16
If you have a series with increasing denominators then you should use parentheses to force the calculator to do as you intended.
1/2+1/(2*4)+1/(2*4*6)
or 1/2 +1/2/4 +1/2/4/6=31/48 or 0.645833333.....3

Oct 09, 2013 | Sharp ELW535 Calculator

1 Answer

When I square a negative number, my calculator gives me a negative number. i.e. -4^2=-16


No, you're not squaring a negative number, you're negating a square. When you press (-) 4 ^ 2 ENTER , the calculator is calculating -(4^2). 4^2 is 16, and the negative of that is -16. What you want to do is to calculate (-4)^2 by pressing ( (-) 4 ) ^ 2 ENTER .

Jul 11, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

I am trying to divide a whole into a smaller number that is a decimal, any help? The question is 5 divide into o.45


You didn't specify the make and model of your calculator, so I can't give you an exact keystroke sequence.

The calculator doesn't care whether a number is a whole number or not. Just do the division.

On most algebraic-logic calculators, to divide 5 into 0.45, press . 4 5 / 5 =
On an RPN or RPL calculator, press . 4 5 ENTER 5 /

On most algebraic-logic calculators, to divide 5 by 0.45, press 5 / . 4 5 =
On an RPN or RPL calculator, press 5 ENTER . 4 5 /

If you still have problems, please reply to this post specifying the make and model of the calculator you're trying to use.

Mar 14, 2011 | Office Equipment & Supplies

1 Answer

How to calculate mod of a number in scintific calculator


To calculate modulo with the FX-115MS calculator, follow these steps:

e.g.: 9%4=1

9 (minus) 9 (divide) 4 (times) 4 =

so, 9-9/4*4 will yield the correct answer of 1

May 25, 2010 | Casio FX-115MS Plus Calculator

1 Answer

Calculate sixty-nine to the third power using only 4 and 7 digit. In the calculater, you only allow to use 4 and 7 digit to get the answer for sixty-nine to the third power. what are the steps to do this?...


  1. You need no calculator to do that.
  2. I fail to perceive any redeeming value to this endeavor of yours.
  3. Here are your steps.
  • 69=64+1+4 =4^3 +(4/4) +4=4^(7-4) + (4/4) +4
  • 69^3= {4^(7-4) + (4/4) +4}^(7-4).
So? I do not feel any the smarter for answering this taunt. Rather the contrary.

Feb 25, 2010 | Texas Instruments TI-89 Calculator

2 Answers

M mod n in Casio fx991MS


there is one button ab/c beneath CALC... if u want to calculate 7 mod 4 then... u should press 7 then ab/c 4 and equal to
1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...

Jun 29, 2009 | Casio FX-115MS Plus Calculator

1 Answer

Hi i have the canon p170-DH and i cant subtract. example: 4-4= -8 not 0


Hi....by looking at the date you posted this question, you may have already found the answer, but just in case you haven't......the procedure for adding and subtracting on these calculators is completely opposite of a regular calculator. On a regular calculator, you would input 4 - 4 = 0. On these type of calculators, a number's positive or negative status is keyed in AFTER the number, instead of before it. Therefore, you input 4 + 4 - (notice you DO NOT input = at the end, but if you are in print mode, you will need to hit your total key, which looks like an asterisk, where the = would normally be, in order for the final value of your calculations to print on the paper tape.

Multiplication and division equations are done exactly as they are on a regular calculator....4 x 4 = 16.

Hope this helps. If you have your owners manual, it should also give you some examples of how to perform calculations with your calculator.

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11 Answers

How to calculate log value in calculator with different base value


In any scientific calculator log2(n) can be  calculated with either ln or log function as follows
 
Log2(n)= ln(n) / ln(2)
 
Or
Log2(n)=log(n) / log(2)

both will give nearly the same answers

Dec 08, 2007 | Casio FX-300MS Calculator

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