# Questions on Algebra: Logarithm answered by real tutors!

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 Algebra: Logarithm Solvers Lessons Answers archive Quiz In Depth

 Question 41583: write as a logarithm of a single number: 2lna+7lnb-3lnc-lnd a= ln(14ab/3cd) b= ln(14abd/3c) c= ln(a^2b^7d/c^3) d= ln(a^2b^7/c^3d) Click here to see answer by stanbon(57410)

 Question 41587: solve: (0.8)^n=e^2 i dont know what type of problem it is so i put logarithm Click here to see answer by stanbon(57410)

 Question 41576: Solve the following equations: a) 5^2x+1=48 b) log6(x+41)-log4(x+1)=2 Click here to see answer by AnlytcPhil(1278)

 Question 41815: I need your help to solve for x in the equation 3ln(2-x)=6 I tried to solve it but I'm not sure if my answer is correct 3ln(2-x)=6 ln2/lnx=2 ln2=2lnx e^(2-x)=2 ln(2-x)=2 e^2=e^ln(x+5) e^2-5=x Click here to see answer by venugopalramana(3286)

 Question 42137: what is the value of x? log x=3.1 Click here to see answer by fractalier(2101)

 Question 42305: find an appropriate rational solution to each equation. round answer to four decimal places 3^x=12 Click here to see answer by fractalier(2101)

 Question 41721: Use the properties of Logarithms to evaluate: Log sub3 9+Log sub3 36-log sub3 4. Click here to see answer by fractalier(2101)

 Question 42403: Question with logarithms: Hi I'm wondering something about logarithms. I have this equation to prove which looks like this: b ^ log_b (x) = x Where ^ means exponent and _ means subscript. Click here to see answer by fractalier(2101)

 Question 42307: Colombian Earthquake of 1906 At 8.6 on the richter scale, the Colombian earthquake of January 31, 1906, was one of the strongest earthquakes on record. Use the formula log(I)-log(Io) to write I as a multiple of Io for this earthquake. Click here to see answer by fractalier(2101)

 Question 41178: I need to solve this log problem: 1) log( 8, (n-3)) + log( 8 (n + 4)) =1 I believe that the "logs" cancel out because they both have the same base. Then I dont understandwhat to do from there Click here to see answer by Nate(3500)

 Question 42545: Express as a sum of logarithms: log 0.2x Click here to see answer by fractalier(2101)

 Question 36009: I'm not sure how to write this problem as a single logarithm and simplify it, if possible. 3log5^2-2log5^3 Click here to see answer by tran3209(100)
 Question 36009: I'm not sure how to write this problem as a single logarithm and simplify it, if possible. 3log5^2-2log5^3 Click here to see answer by Nate(3500)

 Question 43039: ```Given that 0.475 < log base 10 of 3 < 0.478, how many digits are in the number 350? Click here to see answer by AnlytcPhil(1278)  ```

 Question 43262: solve x logx 25 = -2 ***the x is subscript of log Click here to see answer by venugopalramana(3286)
 Question 43262: solve x logx 25 = -2 ***the x is subscript of log Click here to see answer by AnlytcPhil(1278)

 Question 43432: James did the following addition problem: 440 + 340 = 1000. This problem is done correctly. In what base was James writing his numbers? Click here to see answer by fractalier(2101)

 Question 43604: What in the world does this mean? Please Please, HELP! Using a calculator, find log 10000 where log means log to the base of 10. Answer Most calculators have 2 different logs on the: log, which is based, 10, and In, which is based e. In computer science, digital computers are based on the binary numbering system which means that there are only 2 numbers available to the computer, 0 and 1. When a computer scientist needs a logarithm, he/she uses a log to the base 2. To find the log of a number to any base, we can use a conversion formula as shown here: Click here to see answer by stanbon(57410)

 Question 43687: solve for x 2+4(5)^x=16 Solve for x Log of 7 (5x-1)=2 Log of 2 (1- x) - Log of 2 (-2x)=3 Log (-2x)+ Log (3)=Log (96) Click here to see answer by stanbon(57410)

 Question 43697: Solve for x Log of 2 2^x-5=5 I have x=7.32 Lne^-2x=-10 I have X=1.61 3^x = 30 I have 3.096 Use change of base formula and a clculator to approximate each logarithm to 3 decimal places. Log of 5 1.256 I have =0.142 Log(-7)= can't take lof of a negative number. Please help. Click here to see answer by Nate(3500)

 Question 43696: Suppose and g(x) =Ln (3-x) Evaluate the following to 3 decimal places. A. f(2.7) I have -1.204 B. g(-5) I have 2.079 Click here to see answer by Nate(3500)

 Question 44020: Find the number log5(1/5). Thanks for any help available. Click here to see answer by stanbon(57410)

 Question 44021: How do i express u=ln x^2 as a function of u? Click here to see answer by stanbon(57410)

 Question 44102: Given that log a (x)=3.58 and log a (y)=4.79, find log a (y/x). Thank you for any help. Click here to see answer by fractalier(2101)

 Question 44103: Write the expression log a(y+5)+2log a (x+1) as one logarithm. Thank you for your help on this:) Click here to see answer by fractalier(2101)