Questions on Algebra: Logarithm answered by real tutors!

Tutors Answer Your Questions about logarithm (FREE)

Question 318491: Determine the average rate of change of f(x) = x2-4 on the interval [3,3+h]
Click here to see answer by Fombitz(13828)

Question 318571: I need to find log a 75
With the given values of log a 2= 0.431 and
log a 8= 1.292
The problem should read as logarithm of 75 with a base of (a)
Click here to see answer by scott8148(6628)

Question 318706: log 3 - log 9 Using the Quotient Rule express as a single logarithm
Click here to see answer by nyc_function(2733)

Question 318989: convert to a logarithmic equation
e^-2=0.1352
please explain!!
Click here to see answer by Edwin McCravy(8909)

Question 319021: Write 5x = 40 as a logarithmic function
Click here to see answer by Fombitz(13828)

Question 319269: Please solve the equation with full steps : 2^2x-3*2^2x+2+32=0
Click here to see answer by devjyotsingh24(4)

Question 319398: Solve the following equations: 2x+9(root over)=13-x
Click here to see answer by mananth(12270)

Question 319618: log (tan0.25 .22/7
22/7
Click here to see answer by Alan3354(30993)

Question 319660: Hi, This is my last problem on my homework for the nite and it is due tonite. I got all my other work done with no problem but am having an issue with this one.
Express the formula so that the expression in brackets is written as a single logarithim.
Here is the formula... t= 1/c [ln A - ln (A-N)]
Click here to see answer by Alan3354(30993)

Question 319720: log 25 5=x
solve the equation for value of the variable x.
This problem should read as x is called the logarithm of 5 with a base of 25.
Thanks for taking the time to look at this, it is appreciated.
Click here to see answer by jim_thompson5910(28595)

Question 319722: Solve the following equation for the value of the variable x.
log 25 5 = x
the problem should read as x is the logarithm of 5 with base of 25.
Thank you for taking a look at this, it is appreciated.
Click here to see answer by Earlsdon(6287)

Question 319764: log(x,1o) * log(110-x,10) = 2
Click here to see answer by Alan3354(30993)

Question 319652: 3 raised to x plus 3 plus 3 raised X = 84
Click here to see answer by josmiceli(9686)

Question 319899: what is the product of 2 log x = log 8?
I hope you could give me an exact answer, and thanks for your help.
Click here to see answer by josmiceli(9686)

Question 319930: rewrite as logarithmic equation
9^2=81
Click here to see answer by scott8148(6628)

Question 320008: Change the exponential equation to a logarithmic equation.
2.3^x+5=15
Thanks for your help!
Click here to see answer by unlockmath(1602)

Question 320082: solve this equation in detail
y=400*4*-.415
Click here to see answer by checkley77(12569)

Question 320173: Please help me solve this equation: 4^x3^x+1=2
Click here to see answer by Fombitz(13828)

Question 320169: Please help me solve this equation: xlog(4)=6-xlog(25)
Click here to see answer by Alan3354(30993)

Question 320350: simplify the expression.
ln(x^2+8x+15)-ln(x+3)
thank you for the help!
Click here to see answer by Fombitz(13828)

Question 320353: find the logarithm.
log 10^-4=?
Click here to see answer by Fombitz(13828)

Question 320721: how do I find the log of 367
Click here to see answer by stanbon(57361)

Question 320769: log5 125^-3
I got this:
log 5 (125^ -3) = -3 log 5(125) = -3(+3) = -9 since 125 = 5^3 we get log5(125) = 3
But that is not right can someone please help me?
Second one
The number of industrial jobs in Fulton County is decreasin by 9% per yr. If there are 12,600 industrial jobs in Fulton Cty this yr, estimate the number if industrial jobs, to the nearest hundred in 10yrs Choices 1) 29,800 2) 11,300 3) 4900 4) 1300
I got 29,800 by doing this 12 600 (1.09)^1 0 = 29800--but obviously the number of jobs will be more than 12 600 and only the one choice is possible, but my answer is not right.....
Click here to see answer by solver91311(16897)

Question 321134: what is the solution set for log (x+9) - log2= log (5x+1)
Click here to see answer by solver91311(16897)

Question 321124: How do I write log x + log 7 - log y as a single logarithm
Click here to see answer by nerdybill(6962)

Question 321205: Thank you for any help you may be able to provide. I am having trouble solving this equation.
9log(3x-8)=1
log(3x-8)=1/9
then write as exponential equation
3x-8= square root of what? I do not know how to find the root in order to solve this THANKS again
Click here to see answer by scott8148(6628)

Question 321203: I am taking a biochemistry class and it has been a long time since I've had to work with logs/Logs (I don't understand the difference). This is my question:
160x10^-9=Log160^-9=2.2^-9=-6.8
They had me up to 2.2^-9. How does that become -6.8?
Click here to see answer by scott8148(6628)

Question 321219: Using the definition of logarithm to solve logrithms equations, solve this: 2ln(8x)=8. What is the answer? Please help. And the other question is: 16 grams of carbon-14 present. The decay model A=16e -0.000121 t decribes the amount of carbon -14 present after t years. How many grams of carbon-14 will be prestent in 9477 years? Please, I need this done by Sunday before midnight! Thanks!
Click here to see answer by ankor@dixie-net.com(15656)

Question 321288: logx 2 = 0.431 and logx 3 = 0.683, what is logx 12?
Click here to see answer by Earlsdon(6287)

Question 321498: What would "log base b (log base b of b)" be simplified to?
Click here to see answer by jim_thompson5910(28595)

Question 321563: How can I solve this logarithmic equation:
5+ln(8x)=23-2lnx
Click here to see answer by Fombitz(13828)

Question 321756: solve for x: log(x-2) + log(x+2) = 1
Thanks
Click here to see answer by stanbon(57361)

Question 322085: A man goes form his home to his office at the speed 20 km/h and returns form his office to home at the speed of 30 km/h . his mean speed is ?
Click here to see answer by JBarnum(2044)

Question 322128: Please help!
Evaluate the following,
Log(0.5)27.1
answer is loosely -4.7602
when I use calculator I am getting -8.157912882
obviously I am off track, but I do not know where.
Thanks

Click here to see answer by Alan3354(30993)

Question 322086: the value of is ?
Click here to see answer by Edwin McCravy(8909)

Question 322096: log with base e of 3
Click here to see answer by Alan3354(30993)

Question 322267: a^2 + b^2 = 14ab verify
log{1/4(a + b) = 1/2(loga + logb)}
Click here to see answer by Fombitz(13828)

Question 322336: rewrite as single logarithm. 1/3logz + 5logx - 2logy
Thanks
Click here to see answer by Fombitz(13828)

Question 322465: Can you please combine 4 ln sqrt x - ln (xy^5) + 3 ln y?
Thank you.
Click here to see answer by jim_thompson5910(28595)

Question 322486: log3 x = 4.3
Click here to see answer by solver91311(16897)

Question 322574: Solve for x
ln[ln(e^-x)]=ln3
I am unable to figure out how to even begin on this problem. Your help would be much appreciated.
Thank you!
Click here to see answer by Fombitz(13828)

Question 322572: -3(.75)^x+1=29
If you could help me solve this I would greatly appreciate it. I keep getting a negative which makes the problem invalid...but the solution I was given (problem not worked out) was x=4.819
Thank you!
Click here to see answer by Fombitz(13828)

Question 322577: I am wondering if someone can show me the easiest way to solve and graph the equation
f(x)=-log(-x-1)+2=-(log[-(x+1)]-2)

thank you for your help
Click here to see answer by Fombitz(13828)

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