# Questions on Algebra: Logarithm answered by real tutors!

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 Algebra: Logarithm Solvers Lessons Answers archive Quiz In Depth

 Question 63808: Hi, I wonder if you can help i can solve log equations with numbers in front but i am struggling with equations like this one: ln(2x-1) + ln(2x+1) = 1.5 Would it be possible to show the process of calculating equation. Thanks Click here to see answer by ankor@dixie-net.com(15660)

 Question 64045: Can you help me on the basics of solving Logarithm problems? I am a college sutudent taking a final . Click here to see answer by joyofmath(189)

 Question 64162: How do you solve the following equations? log2(3x+2)-log2(x+2)=1 and ln(x-1)=4-ln(x+2) i've tried repeatedly and my professor won't help! Click here to see answer by josmiceli(9697)
 Question 64162: How do you solve the following equations? log2(3x+2)-log2(x+2)=1 and ln(x-1)=4-ln(x+2) i've tried repeatedly and my professor won't help! Click here to see answer by stanbon(57387)

 Question 64187: Need help with Logarithms a) Using a calculator, find log 10000 where log means log to the base of 10. b) Most calculators have 2 different logs on them: log, which is based 10, and ln, 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: log( b, a ) = log (a)/log (b) Using this formula, find log ( 2, 10000 ) Round your answer to the hundredth's place. Show work. Click here to see answer by stanbon(57387)

 Question 64195: log27^x=4/3 Click here to see answer by burkus(4)

 Question 64366: I have a log question... I am having a hard time setting up this problem... please help me.. log 25=x 5 and log (5)^-2 5 can you please help me thank you..... Click here to see answer by stanbon(57387)

 Question 64449: If logk4=2/3 then k=? Thank you Click here to see answer by stanbon(57387)

 Question 64489: Working on a logarithm problem but having difficulty. Thanks! Find the value of x for both log41=x log3 x=5 on the log4, the four is just below the log. Hope that is clear enough.Thanks! Click here to see answer by Earlsdon(6287)

 Question 64503: I have been troubleing over this Question for awhile now tried solving it with question No. 63487 from this website but the numbers were close but not exact. 3^x=7.5^(x-2) Click here to see answer by ankor@dixie-net.com(15660)

 Question 64527: Solve the equation e^x+e^-x/2=2.5. State the exact solutions, in terms of natural logarithhm of an expression in simplest radical from. Click here to see answer by stanbon(57387)

 Question 64539: Solve for x: ln(x+1)-ln(x-2)=lnx Click here to see answer by stanbon(57387)

 Question 64604: Solve. (Express your solution in terms of natural logs, not a decimal.) 23^x = 205 Click here to see answer by 303795(595)

 Question 64606: Solve. (Express your answer in terms of e). 2 – 3 ln x = -25 Click here to see answer by tanimachatterjee(60)

 Question 64825: SOLVE THE EQUATION In(x+5)-In(3)=In(x-3). Click here to see answer by funmath(2925)

 Question 64940: Please help! Sketch a graph of the function f(x) = 2 - log2(x - 2). Label at least three points, and show any asymptotes as dotted lines. Click here to see answer by venugopalramana(3286)

 Question 64943: Solve, and express your answer in exact form: 3^x = 4^(l-x) Click here to see answer by funmath(2925)

 Question 64942: Solve, and express you answer in exact form: log(x) + ln(x) = 1 Click here to see answer by stanbon(57387)

 Question 64922: Please help: Write log (down from log x)^y = z in exponential form. Click here to see answer by stanbon(57387)

 Question 64941: Sketch a graph of the function f(x) = e^(1-x). Label at least three points, and show any asymptotes as dotted lines. Click here to see answer by stanbon(57387)

 Question 64967: 4loga(8x^4)-1/8loga(6x+7) Click here to see answer by funmath(2925)

 Question 65031: I have to turn this in tomorrow and I still haven't been able to figure out. Can any give me a hand? Thanks! solve 3^x-1=2 solving for x. Give answer to four decimal places. thanks again! Click here to see answer by stanbon(57387)

 Question 65033: Another I have to turn in and I am still having trouble with. HELP! Write the expression in terms of the logarithms of x and y: log 5x^2/square root of y y is under a square root symbol. Hope that is clear enough. Thanks! Click here to see answer by stanbon(57387)

 Question 65185: I need to write this in exponential form, not sure on this one because it is a fraction. Thanks. log125 25 = 2/3 Click here to see answer by Earlsdon(6287)

 Question 65200: Any help on this would be great... A computer is infected with the Sasser virus. Assume that it infects 20 other computers within 5 minutes; and that these PCs and servers each infect 20 more machines within another five minutes, etc. How long until 100 million computers are infected? Click here to see answer by stanbon(57387)

 Question 65223: 2log2+3logx-1/2{log(x+3)+(x-2)} i am having such a hard time with this question!!!!! Click here to see answer by stanbon(57387)

 Question 65262: I am having difficulty with this question.... I have to find the x intercept of y=x^3-2x^2-8x and log x+log(x+1)=log 12 can someone please help me.. Click here to see answer by stanbon(57387)

 Question 65402: I worked this problem a million times and can get the right answer can anyone help? (g-8)+4=-12+3g Click here to see answer by stanbon(57387)
 Question 65402: I worked this problem a million times and can get the right answer can anyone help? (g-8)+4=-12+3g Click here to see answer by chitra(359)

 Question 65586: This equation baffles me. 4^2x+1=2^3x+6 I need to solve this, can anyone help? Click here to see answer by Nate(3500)
 Question 65586: This equation baffles me. 4^2x+1=2^3x+6 I need to solve this, can anyone help? Click here to see answer by checkley71(8403)

 Question 65585: I need some help with Logarithms. "For the function defined by f(x)=5x-4, find a formula for f^-1(x)." Thank you. Click here to see answer by Nate(3500)

 Question 65621: I need help to find an exponential function of the form f(x)=ba^x+c with y-intercept 2, horizontal asymptote y=-2, that passes through the point P(1,4). Does anyone grasp this? Click here to see answer by stanbon(57387)
 Question 65621: I need help to find an exponential function of the form f(x)=ba^x+c with y-intercept 2, horizontal asymptote y=-2, that passes through the point P(1,4). Does anyone grasp this? Click here to see answer by venugopalramana(3286)

 Question 65624: 10. The half-life of radioactive potassium is 1.3 billion years. If 10 grams is present now, how much will be present in 100 years? In 1000 years? 12.A fossilized leaf contains 70% of its normal amount of carbon 14. How old is the fossil? Click here to see answer by Nate(3500)

 Question 65651: Can someone help me find a number log on a graphing calculator? I need to find the number Log5(1/5). Thanx! Click here to see answer by josmiceli(9697)

 Question 65649: If a bacteria culture started with a count of 480 at 8:00 am and after t hours is expected to grow to f(t)=480(3/2)^t. I am trying to estimate the number of bacteria in the culture at noon the same day. Click here to see answer by josmiceli(9697)

 Question 65653: Good evening! The amount "A" is an account after "t" years from an initial principle "P" invested at an annual rate "r" compounded continuously is given by A=Pe^rt where "r" is expressed as a decimal. I need to solve this formula for "t" in terms of A,P, and r. Click here to see answer by Nate(3500)

 Question 65650: For the function defined by f(x)=2-x^2, 0 is < and = to x, I need to find a formula for f^-1(x). This is real frustrating... Click here to see answer by praseenakos@yahoo.com(507)

 Question 65652: I also need help with "log^a(8x+5)=log^a(4x+29)" Thanx! Click here to see answer by funmath(2925)

 Question 65663: Write the expression log^a(y+5)+2log^a(x+1) as one logarithm. Thanks! Click here to see answer by Earlsdon(6287)

 Question 65662: Given that log^a (x)=3.58 and log^a (y)=4.79, find log^a(y/x). Click here to see answer by Earlsdon(6287)

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