Questions on Algebra: Logarithm answered by real tutors!

Tutors Answer Your Questions about logarithm (FREE)

Question 288343: express as a single logarithm:
log[6](18)+log[6](48)-2log[6](2)
Click here to see answer by Theo(3458)

Question 288463: Hi, I'm really not sure how to solve this problem.
log(2x)=log(x+70)
Each log has base 10. Any help would be really appreciated!
Click here to see answer by Alan3354(30993)

Question 288409: Using only the information that =A and =B show how to find log[160,000/3] in terms of A and B
Click here to see answer by Alan3354(30993)

Question 288472: I would really be grateful for any help on this problem.
ln(1/((e^x)+11)
Click here to see answer by jsmallt9(3296)

Question 288337: express as a sums/difference log17 (x^3y^5/z^4) I goofed on the previous question posted.
Click here to see answer by jsmallt9(3296)

Question 288936: (LOG64^600)/(LOG4)
This is what I have done so far. I don't know how to write it on here the actual question. This is the question using change of base formula. so it was something like log subscript four of sixtyfour to he power of six hundred.
Click here to see answer by Alan3354(30993)

Question 288900: how do i solve log2 1/8
Click here to see answer by Alan3354(30993)

Question 288900: how do i solve log2 1/8
Click here to see answer by alegriajoy33(14)

Question 289032: Can you please help me with this question (the steps to finding the answer)
Solve algebraically for t:
4^(-3t) = .10
Thank you!
Click here to see answer by mananth(12270)

Question 289130: what values of x cannot possible be solutions of the equations loga(2x-7)=4
Click here to see answer by jim_thompson5910(28536)

Question 289136: y=cube root of x
Click here to see answer by jim_thompson5910(28536)

Question 289140: 3^x+2 x 3^x=81
Also
3[logx]=6
Click here to see answer by stanbon(57282)

Question 289249: I am trying to solve this logarithmic equation: In(2x+1)-1=In(x-2) I have the answer provided in the text of 8.9611, but would like to see the solution outlined. Thank you.
Click here to see answer by vleith(2825)

Question 289247: I am trying to solve this exponent equation: 3^2-x^2=8 the whole exponent is 2-x^2. I have the answer of + or - .3274, but would like to see the solution outlined. Thank you.
Click here to see answer by dabanfield(803)

Question 289308: Hi I couldnt figure out how to do this problem
LOG6(x+3)+LOG6(x-2)=1
Click here to see answer by stanbon(57282)

Question 289553: Could someone please help me with this?
Find the negative value of x such that 2^log4(1/64) + x^2 = (73/8).
Thanks!
Click here to see answer by CharlesG2(828)

Question 289559: I am trying to solve log(x-1)+log(x+2)=1, I have the answer, which is 3, but am looking to see the problem worked. I appreciate the help. Thank you.

Click here to see answer by jim_thompson5910(28536)

Question 289518: wrie equation in logarithmic form log 100,000
Click here to see answer by unlockmath(1599)

Question 289518: wrie equation in logarithmic form log 100,000
Click here to see answer by Earlsdon(6287)

Question 289496: Hi there. I need to obtain y in terms of x for the following logarithmic equation:
ln(y-1) = 2 ln x + ln y-x
The book answer (given without a working) is y = 1 / (1 - x^2 * E^-x),
but using the logarithmic identities I can only seem to get as far as
y = 1 + x^2 + yE^-x. I'm not sure if my error is in the log identities or the basic algebra. Thanks!
Click here to see answer by CharlesG2(828)

Question 289605: write 12^x=49 in logarithmic form

Click here to see answer by CharlesG2(828)

Question 289615: find the approximate value of the following expression: 3^2.5
a) 15.6
b) 17.0
c) 12.3
d) 11.3
Click here to see answer by checkley77(12569)

Question 289751: ln 800-ln 350/ 0.03
how do I put this in calculator, to find answer
Click here to see answer by stanbon(57282)

Question 289815: 7 ln x = 13, solve for x by changing to exponential form

Click here to see answer by nerdybill(6951)

Question 290196: How do I find the numerical answer for log3(18) - log3(2)? We are not allowed to use calculators.
Click here to see answer by scott8148(6628)

Question 290196: How do I find the numerical answer for log3(18) - log3(2)? We are not allowed to use calculators.
Click here to see answer by nerdybill(6951)

Question 290256: Express this equation in logarithmic form.
b^x = N

Click here to see answer by richwmiller(9135)

Question 290312: I am trying to help a student and cannot seem to solve this problem...
Nate has a savings account that is at 6% per year, he puts in $600 and adds no more.
The book shows that x = 600(1.06)^t where x is total amount in account and
t is the time in years.
How long will it take to reach $2400.. so:
$2400 = $600(1.06)^t if I have my logs correct that means
first you divide by 600 so the statement reads
4 = (1.06)^t then t=log(1.06)(4)...this answer comes out to be .10 which is no where near the right answer which should be around 12.
Any ideas as to what I am doing wrong?
thanks
Click here to see answer by scott8148(6628)

Question 290304: How to graph the following logarithms (logx)+5, logx-5, logx, (logx)-5, logx+5
Click here to see answer by jsmallt9(3296)

Question 290260: Express in exact form
3logx=2
Click here to see answer by jsmallt9(3296)

Question 289947: I do not understand how to solve for this problem - when I plug it into my calculator, is says 'ERROR." How do I evaluate this by hand?
Find the value of Log (-2)
Thank you very much!!
Click here to see answer by jsmallt9(3296)

Question 290509: The bacteria E Coli are found in the human bladder. Suppose 1,000 bacteria are present at time t = 0. Then, t minutes later the number of bacteria present can be approximated by N(t) = 1000(3)t/12.
a) How many bacteria will be present after 40 minutes?
b) How long will it take before there are 100,000 bacteria present?
Can someone explain how to solve this problem?
Thank you, Cynthia

Click here to see answer by nerdybill(6951)

Question 290517: Express the following as an equivalent expression using the individual logarithms of w, x, y, and z.
Log a [ (x^3 y ) / ( w^2 z^2 ) ]
I submitted this question without checking the symbols the first time, so i am resubmiting it.
Cynthia
Click here to see answer by richwmiller(9135)

Question 290691: I need help in solving for the following problem:
log3(x-3) = log9x
The 3 and the 9 are subscript numbers - I couldn't get it to type that way.
Click here to see answer by richwmiller(9135)

Question 290717: Expand each logarithm
log7 22xyz

Click here to see answer by richwmiller(9135)

Question 290803: how do I solve for x in this statement?
80^x=500

Click here to see answer by richwmiller(9135)

Question 290802: what is x
log (x-3) - log 2= log(x+1) what are the steps to solve?

Click here to see answer by ankor@dixie-net.com(15645)

Question 290830: I need to solve for x here but I'm not sure how to go about that in this problem.
log(2x)=log(x+9)Thanks!
Click here to see answer by missy12(3)

Question 290830: I need to solve for x here but I'm not sure how to go about that in this problem.
log(2x)=log(x+9)Thanks!
Click here to see answer by ankor@dixie-net.com(15645)

Question 290793: Given that 'p' equals log16 to the base 'q' (p=logq 16),
express in terms of p:
logq (8q) (basically log (8q) to the base 'q'.
i managed to answer a previous question linked to this one asking me to express log2 to the base q in terms of p and i managed to get p/4 which is correct.. so i kinda know what i'm doing so far :)
thank you for your time and help
maxine
Click here to see answer by nerdybill(6951)

Question 290805: Process for solving
log3 ^X + log3 ^(x-8)=2

Click here to see answer by nerdybill(6951)

Question 290953: solve for x, 5 raised to the 3x = 1000
Click here to see answer by dabanfield(803)

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