# Questions on Algebra: Logarithm answered by real tutors!

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 Algebra: Logarithm Solvers Lessons Answers archive Quiz In Depth

 Question 112946: Help! I need help with two problems on my pre-test for my finals. 1. Write log 125 base 5 = 3 in exponential form 2. Simplify:Log 6 base 6 Click here to see answer by jim_thompson5910(28598)

 Question 112962: What is the Evalution of Logarithm of 16? Click here to see answer by jim_thompson5910(28598)

 Question 113161: Phosphorous-32 is used to mark cells in biological experiments. If phosphorous-32 has a continuous daily decay rate of 4.85%, what is the half-life? Click here to see answer by scott8148(6628)

 Question 113219: How do you solve this exactly? log(x+20)-log(x+2)=log x Click here to see answer by bucky(2189)

 Question 113440: I need help with 2 problems using my new TI-84 Plus: 1.find x: log x=3.8893 The answer I got was:.5898714436 Is this correct? 2.find x: log x = -1.5003 I enter LOG(-1.5003) enter and I get an error:syntax message Help!! Click here to see answer by edjones(7569)
 Question 113440: I need help with 2 problems using my new TI-84 Plus: 1.find x: log x=3.8893 The answer I got was:.5898714436 Is this correct? 2.find x: log x = -1.5003 I enter LOG(-1.5003) enter and I get an error:syntax message Help!! Click here to see answer by josmiceli(9697)

 Question 113501: How do I solve this equation. If needed, I can round to the nearest three decimal places. 1nx=2 Click here to see answer by MathLover1(6638)

 Question 113499: How can I write the expression 2.1n x-1n y+3. 1n z as a single lograithm. The periods after the 2 and 3 stands for the (times) sign not periods. Click here to see answer by solver91311(16897)

 Question 113509: How do I write the expression 2. In x-1n y+3 . 1n z as a single logarithm? (note) the (.) after the 2 and 3 represent the times sign. Click here to see answer by stanbon(57387)

 Question 113537: I'm a tutor, but I have a question which I can't answer myself, other tutors please help. How do you solve ? For example which is We all know that 4 satisfies the equation, but how do you actually solve this kind of problems? Is there only one possible solution? Click here to see answer by stanbon(57387)

 Question 113687: Usinng this formula : logb2=0.310, logb3=0.4771, and logb5=0.6990 slove log5 135 and rounded 4 decimals Click here to see answer by stanbon(57387)

 Question 114000: expand and simplify (Do Not find approximations): 1n(e/x) Click here to see answer by jim_thompson5910(28598)

 Question 114080: Use the calculator to find the common logarithm: log 4,700 Choose 1 answer: a.8.4596 b.3.6721 c.4.6739 d.-1.3582 Click here to see answer by stanbon(57387)

 Question 114082: Please help w/pre-test for final. Find f^-1 (x), if it exists, for f(x) = 6x+5 Find the total amount of money in an account if \$8000 was deposited 6 years ago at 2% interest compounded semi-annually. Click here to see answer by stanbon(57387)

 Question 114089: A deposit of \$1000 is made into a fund with an annual interest rate of 10%. Find the time(in years) necessary for the investment to double if the interest is compounded continuously. Click here to see answer by stanbon(57387)

 Question 114090: If ln 4=1.3863, ln 3=1.0986, and lf 5=1.6094, find ln 3/20? Click here to see answer by stanbon(57387)

 Question 114077: Will donate. Please help solve two problems. 1.Use the properties of logarithms to write the following expression as a single logarithm: 2.Use the properties of logarithms to expand the expression as much as possible: Click here to see answer by stanbon(57387)
 Question 114077: Will donate. Please help solve two problems. 1.Use the properties of logarithms to write the following expression as a single logarithm: 2.Use the properties of logarithms to expand the expression as much as possible: Click here to see answer by Edwin McCravy(8909)

 Question 114114: Solve for x: log(x - 5) + log 4 = 2. Click here to see answer by stanbon(57387)

 Question 114128: Write as a single logarithm and simplify (no decimal approximations): 2 log 6 + log x - log 3. Click here to see answer by edjones(7569)

 Question 114124: Solve for x: 3^x = 4 Select an answer below a.log 4/3 b.log 4/3 c.log 4-log 3 d.ln 4/ln 3 Solve for x: 9^x+2 = 27 Select an answer below a.1 b.2/3 c.-1/2 d.-2 Click here to see answer by edjones(7569)

 Question 114126: Find the domain of the function f(x) = ln(12x - 48). Click here to see answer by bucky(2189)

 Question 114159: Need Help, Please! Use the product,quotient, and power rules of logarithms to rewrite the expression as a single logarithm. Assume that all variables represent positive real numbers. 1/2 log(2,x^4) + 1/4 log(2,x^4) - 1/6 log(2,x) Thank you! Click here to see answer by stanbon(57387)

 Question 114092: about this question.. log (7, 1/49) log with a base of 7 Evaluate the logarithm.. log(7, 1/49) or if this is better log7 1/49 (7 is the base) would it be 2 or -2?? because log (7, (1/7)^2 or log7 (1/7)^2 the 7's would cancel leaving 2 Click here to see answer by stanbon(57387)

 Question 114399: Solve: log(subscript 6)x + log(subscript 6)(x-5) = 2 Click here to see answer by edjones(7569)

 Question 114659: I have tried everything and I just don't understand this problem. Here is the problem = Click here to see answer by edjones(7569)
 Question 114659: I have tried everything and I just don't understand this problem. Here is the problem = Click here to see answer by Edwin McCravy(8909)

 Question 114690: How to solve for x in the equation log(sub 5)(x+4) + log(sub 5)(x) = 2 Click here to see answer by edjones(7569)

 Question 115028: I need help Soloving this equation! Not sure How to really Start the problem, ln(x-2)+ln(2x-3)=2lnx Click here to see answer by stanbon(57387)

 Question 115041: I need help solving this equation: 2(2^2t-5)-4=10 and it says to give approximate answer.. im not real sure how to even start it Thanks Click here to see answer by stanbon(57387)

 Question 115033: I need help solving this word problem: The debt on a certain credit card follows the function d=9000*1.015^t where d = debt in \$ and t= time in months. A)How much debt will be owed in t=6 months? B)How long will it take for debt to exceed \$15,000? I think i have A) here is what i did on it: d=9000*1.015^6 d=\$9,840.99 And i couldnt finish b part but here is where i got: \$15,000=9,000*1.015^t 6,000=1.015^t I just dont understand how to get the t down from an exponent and finsih it for t! Any help is greatly appreciated THANKS! Click here to see answer by scott8148(6628)

 Question 115120: 2^x - 6(2^-x) = 6 This problem is from Schaum's Outlines - Precalculus, chapter 19 page 180. That book doesn't provide many examples (let alone good ones) so, while I can solve a similar one (or that same one if I plug = 1 instead of = 6), I don't know how to solve this one. It should be ??? = 3 and then we work it out, but unless I'm muliplying 2^x by 1, I don't know what u will equal. So I can't find the value for x. (2^x)^2 - 6 = 6.2x u^2 = (2^x)^2 u = ??? Click here to see answer by jim_thompson5910(28598)

 Question 115137: Solve the following algebraically: e^x-6e^-x=1; this is what I have thus far. e^x(e^x-6e^-x)=e^x(1) e^2x-6=e^x e^2x-e^x-6=0 then use a quadratic equation to solve: -(-1) +-square root (-1)^2-4(1)(-6)/2(1) 1+-square root 1+24/2 1+-square root 25/2 1+-5/2 = 1.0986 Is this correct? Click here to see answer by jim_thompson5910(28598)
 Question 115137: Solve the following algebraically: e^x-6e^-x=1; this is what I have thus far. e^x(e^x-6e^-x)=e^x(1) e^2x-6=e^x e^2x-e^x-6=0 then use a quadratic equation to solve: -(-1) +-square root (-1)^2-4(1)(-6)/2(1) 1+-square root 1+24/2 1+-square root 25/2 1+-5/2 = 1.0986 Is this correct? Click here to see answer by bucky(2189)