Questions on Algebra: Logarithm answered by real tutors!

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 Question 17622: I need help solving this problem: (0.75)^n < 0.000125 where n is an integer. I'm not supposed to use a calculator and i'm supposed to use log tables. Till now, i've taken log on both sides: n log(0.75) < log 0.000125 . This is where i'm getting stuck. Please help. Thanks a lot Click here to see answer by venugopalramana(3286)

 Question 19124: I am not sure exactly where to start on this homework problem. I would like you to please help me with this problem, so maybe I can get the rest of my homework. Use log base 5 of 2=0.4307 and log base 5 of 3=0.6826 to approximate the value of each expression which is log base 5 of 9. It is kind of difficult and if you understand what I am asking, please help me out on this. Click here to see answer by mmm4444bot(95)

 Question 19560: find the solution of the exponential aquation 2^1-x = 19 in ters of logarithms or correct to four decimal places. Click here to see answer by Earlsdon(6294)

 Question 20128: 5^(log base5 15) Click here to see answer by venugopalramana(3286)

 Question 20134: I am really stuck with this. I need to find x in terms of y by solving I have come up withwhich does not look right also.what am I doing wrong? Thanks in advance for any help. Click here to see answer by AnlytcPhil(1321)

 Question 20265: Can anyone help me solve this problem? Solve for x 4^(5x-3) = 1 I know the answer is 3/5 but don't know how to get there! Thanks! Sandy Click here to see answer by rahman(247)

 Question 20541: What is the value of U in the equation; log(3u+14) - log5 = log2u? I tried to work it myself and got an answer of -9, but I don't think it's right because there was a similar problem in my book but they didn't show you how to do it. Can you please walk me through it? Click here to see answer by AnlytcPhil(1321)

 Question 20542: 4logx + log5 = log405 What is the value of X in this logarithm? When I tried to work it I simplified the equation to logx^4 + log5 = log405. Then I subtracted x from both sides and was left with logx^4 = 400. Please walk me through this because even if I am doing it correctly I don't know what to do next. Click here to see answer by AnlytcPhil(1321)

 Question 20546: What is the value of X in this equation? logX + logX - log3 = log12 I was thinking that you could add log3 to both sides of the equation. However I don't know what to do next. Can you please help me out? Click here to see answer by AnlytcPhil(1321)

 Question 20547: What's the value of N? logn = 2/3log8 I have no idea what I'm even supposed to do first. By the way 2/3 is the fraction two thirds. I'd really appreciate it if you walk me through it. THANKS Click here to see answer by AnlytcPhil(1321)

 Question 20544: Use log5 = 0.6990 and log7 = 0.8451 to evaluate log490 I tried to start it but I kept getting stuck. I appreciate your help. THANKS Click here to see answer by AnlytcPhil(1321)

 Question 20605: Here is my problem: 6^(1-x) = e I'm not sure what to do with this. The answer is .44 Please help! Thanks, Sandy Click here to see answer by Earlsdon(6294)

 Question 20604: Can anyone help with this one? 3^(2x+5) = 4 I started with (2x+5) log3 = log4 then 2xlog3 + 5log3 = log4 but now I'm lost, I know the answer is -1.87 Click here to see answer by Earlsdon(6294)

 Question 20603: Please help me with this problem: logb^2 = .25596, logb^3 = .40568, logb^5 = .59432 logb^(5/12)^3 I know the answer is .096984, but don't know how to go about it. Thanks, Sandy Click here to see answer by venugopalramana(3286)

 Question 20616: Here is my question: 7^logx = 7 the answer is 10, but I am not quite sure what to do when the log is an exponent of 7. I'm also supposed to show a check of my answer. Thanks Sandy Click here to see answer by Earlsdon(6294)

 Question 20540: What is the value of W? log48 - logw = log4 When I did the equation the first time I got zero, but the second time I got 44. What I did was cancel out the log on both sides and was left with 48-w=4. When I solved I got 44. Can you please help me and tell me if my answer is correct or not? Thanks Click here to see answer by Earlsdon(6294)

 Question 20543: What is the value of X in this logarithm? log(2x-5) + 1 = log(7x+10) Please walk me through this equation. Click here to see answer by Earlsdon(6294)

 Question 20635: 2(3)^x=5^(x-1) I dont understand how to find x , can someone please help me? Click here to see answer by venugopalramana(3286)

 Question 20664: I am getting really frustrated because I don't know how to go about solving this at all. Use log5 = 0.6990 and log7 = 0.8451 to evaluate log0.05 PLEASE walk me through this!! Click here to see answer by venugopalramana(3286)

 Question 20730: Can anyone help solve this? 1 - logx = log(3x-1) I tried: 1 - logx = log 3x - log 1 1 = logx + log 3x - log 1 1 = log4x - log 1 I also tried: 1 - logx = log(3x-1) divide both sides by log 1-x = (3x-1) 2 - x = 3x 2 = 4x 1/2 = x Or: 1 - logx = log(3x-1) 1 - 10 = log3x - log -9 = 3logx - log -9 = 3(10) - log -9 = 30 - log -39 = -log The teacher's answer is 2 Can anyone help? Thanks, Sandy Click here to see answer by Earlsdon(6294)

 Question 20723: I'm about to go crazy over here trying to figure out this problem!!! Can you PLEASE tell me the value of M in the equation; log(3m+7) - log(m+4) = 2log6 - 3log3. I tried to solve it, but I got stuck. I got as far as log(3m+7) - log(m+4) = log36 - log27. PLEASE HELP ME!!! Click here to see answer by askmemath(368)

 Question 20724: I REALLY REALLY NEED HELP A.S.A.P. What is the value of N in the equation: log(n-3) + log(n+4) = 1. I REALLY REALLY appreciate the help because I really need it. Sorry for the short notice. Click here to see answer by venugopalramana(3286)
 Question 20724: I REALLY REALLY NEED HELP A.S.A.P. What is the value of N in the equation: log(n-3) + log(n+4) = 1. I REALLY REALLY appreciate the help because I really need it. Sorry for the short notice. Click here to see answer by kapilsinghi(68)

 Question 20718: CAN SOMEONE, ANYONE PLEASE PLEASE HELP ME!!! I really need help. What is the value of X in the equation, log(2x+8) - log(2x^2+21x+61) = -3 Click here to see answer by venugopalramana(3286)
 Question 20718: CAN SOMEONE, ANYONE PLEASE PLEASE HELP ME!!! I really need help. What is the value of X in the equation, log(2x+8) - log(2x^2+21x+61) = -3 Click here to see answer by askmemath(368)

 Question 20728: Can anyone please help with the following problem? In * sqrt of (x^2 + x over 6) = 0 I tried: In (x^2 +x over 6)^1/2 = 0 1/2 In x^2 - 1/2 In 6 = 0 But I don't know where to go from there! The teacher's answer is (-3,2) Thanks, Sandy Click here to see answer by kapilsinghi(68)

 Question 20489: Can anyone help me solve this problem? 6^(1-x) = e I start with: in6^(1-x) = in e (1-x) in6 = 1 in6 - xin6 = 1 and now I'm totally lost. The answer is.44 Thanks, Sandy Click here to see answer by venugopalramana(3286)

 Question 20488: Can anyone help with this problem? 3^(2x+5) = 4 I start with: log3^(2x+5) = log 4 (2x+5) log3 = log 4 then I get stuck the answer is -1.87 Thanks, Sandy Click here to see answer by venugopalramana(3286)

 Question 21106: inverse of y=3x=4 Click here to see answer by algebrapro18(206)

 Question 21198: log3(x-2)=log3(x+2)+2 Click here to see answer by longjonsilver(2297)

 Question 21192: Good evening, I need your help to solve for the exponent t. 5^t = 7^(t+1). I started with t log 5 = (t+1) log 7. So, I tried deducting (t+1) from both sides and then divide log 7 from both sides, but didn't really understand. Please help. Joanna Click here to see answer by longjonsilver(2297)

 Question 19307: What is an expression ? Click here to see answer by Bunnie_Bee(1)
 Question 19307: What is an expression ? Click here to see answer by lola_fish99(13)

 Question 20558: What is M equal to in: log(3m+7) - log(m+4) = 2log6 - 3log3 I was thinking that you add log(m+4) to both sides, but i believe that isn't right. Click here to see answer by venugopalramana(3286)

 Question 21169: I dont underdtand this question at all. It says write as a single logarithm. 2log x-log y+log z-3log w?? Click here to see answer by venugopalramana(3286)