# Questions on Algebra: Logarithm answered by real tutors!

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 Algebra: Logarithm Solvers Lessons Answers archive Quiz In Depth

 Question 205759: Change each logarithmic form to an equivalent exponential form: (please show your work on how you reached the deteriminations) a. log( 3, 81) = 4 b. log( 10, 0.0001) = 4 c. log( 3, (1/243) = -5 -------------------------------------------- I'm not sure if the formula above turned out correctly, but if it didn't, I tried to spell it out below: a. Should read, log with the 3 below the g, then 81 =4 b. Should read, log with the 10 below the g, then 0.0001 = –4 c. Should read log with the 3 below the g, then in paranthesis 1 over 243, end of paranthesis = - 5 Click here to see answer by stanbon(57409)

 Question 205987: solve and check for extraneous solutions: In square root (x-3)=1 Click here to see answer by edjones(7569)

 Question 206028: Solve for x (without using a calculator) (log3)x2 = 2(log3)4 – 4(log3)5 All 3's are subscripts--base 3 The x2 means x squared Click here to see answer by Alan3354(30993)

 Question 206092: I am reviewing for a test, the expression is 9^x = 3^x-8, The answer from the review is 8, but I believe it's wrong, so I need help with it. Thank you. Click here to see answer by vleith(2825)

 Question 206136: Rewrite the following expression as a single logarithm: 3 ln x-5 + ln (x-6) + 1/4 ln (x+9) Click here to see answer by Marth(57)

 Question 206233: write 3log u - log v - 4log z expression as a single logarithm Click here to see answer by stanbon(57409)
 Question 206233: write 3log u - log v - 4log z expression as a single logarithm Click here to see answer by Theo(3464)

 Question 206454: 2 log(base 4) 9 - log(base 2) 3 Click here to see answer by stanbon(57409)

 Question 206817: How long would it take for \$1000 to grow to \$4300 at 5% interest. Compounding quarterly. The answer for this 29.4 but I have a feeling that this answer is wrong. Please go step by step. Thank you so much. Click here to see answer by Alan3354(30993)

 Question 206898: log6 (sqrt x) + log6 (sqrt 6x+5) = 1 Click here to see answer by nerdybill(6963)

 Question 207052: Please Please I need help solving a problem in algebra. The problem is that I am trying to find the logarithmic formula for finding the pH of a substance. The substance that I am using is a grapefruit. The pH is 3.3. Can you help me find the formula. Thank you very much for helping me. Click here to see answer by scott8148(6628)

 Question 207168: maya has deposited \$600 in an account that pays 5.64% interest, compounded continuously. How long will it take for her money to double? Thank you so much for your help!! Click here to see answer by jojo14344(1512)

 Question 207170: Thank you in advance for your help!!! Suppose that \$2000 is invested at a rate of 6% per year compounded continuously. What is the balance after 1 year? After 2 years? Click here to see answer by solver91311(16897)

 Question 207198: 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 5 minutes, etc. How long until 100 million computers are effected? Thank you for your help!!! Click here to see answer by Theo(3464)

 Question 207458: if the problem is: y=log(2x-12) then what is the domain in interval notation? i tried to solve this problem, but i didn't know what the base of the log was. Click here to see answer by jsmallt9(3296)

 Question 207535: Solve for x where x is a real number log x + log (x-3) = 1 Click here to see answer by HyperBrain(694)

 Question 207563: I need to find out how to write \$10,000,000 in exponential form. I don't have a clue. it's only the second day of school and we don't have our math books yet. Please help!!!!! Click here to see answer by nerdybill(6963)
 Question 207563: I need to find out how to write \$10,000,000 in exponential form. I don't have a clue. it's only the second day of school and we don't have our math books yet. Please help!!!!! Click here to see answer by MathTherapy(1430)

 Question 207714: logarithms... 2log(base2)x+log(base2)5=4 how do u solve that in exact form Click here to see answer by stanbon(57409)

 Question 207881: How do you solve a logarithmic word problem of this nature. LAW A lawyer has determined that the number of people P(t)in a city of 1,200,000 people who have been exposed to a news item after t days is given by the function P(t)=1,200,000(1-e^-0.03t) a. How many days after major crime has been reported have 40% of the population heard of the crime? b. A defense lawyer knows it will be very difficult to pick an unbiased jury after 80% of the population have heard of the crime. After how many days will 80% of the population have heard of the crime? Click here to see answer by Theo(3464)

 Question 207963: what is the description of formation in h(x)=-e^x? Is it reflected in the y-axis? or the x-axis? I'm so confused.... Click here to see answer by jim_thompson5910(28598)
 Question 207963: what is the description of formation in h(x)=-e^x? Is it reflected in the y-axis? or the x-axis? I'm so confused.... Click here to see answer by stanbon(57409)

 Question 207962: what is the equation to find out what is the asymptote of g(x)=e^x+2? Click here to see answer by stanbon(57409)

 Question 208058: I am trying to find the domain of f(t)=4.5et Click here to see answer by stanbon(57409)

 Question 208074: a=p(1+r/n)nt I am trying to calculate the return(a) if the bank compunds quarterly(n=4) Round answer to nearest cent. I entered 2000*(1+0.08/4)^4*5= Click here to see answer by Alan3354(30993)

 Question 208081: Hello! I have been working on this problem for the past 20 min P=13+45ln x represents the percentage of inbound email in the us that is considered spam, where x is the number of years after 2000. calculate to 6 decimals on each step when necessary. Determine the percentage of spam in the year 2003. Round answer to 2 decimals. Click here to see answer by jim_thompson5910(28598)

 Question 208086: How many years will it take for percent of spam to reach 95% and spammers dont change.? p=13+45ln (x) p=95 95-13=45ln(x) I got this far. I'm so confused! Click here to see answer by jim_thompson5910(28598)

 Question 208089: if a bank compounds continuously, then the formula used is A=Pe rt where e is a constant and equals approximately 2.7183. Calculate A with continuous compounding. Round answer to nearest cent. deposit is 2,000 for 5 years of 8% I'm not sure if I use the answer I received from the previous question or use the deposit,years and percent. Click here to see answer by Alan3354(30993)
 Question 208089: if a bank compounds continuously, then the formula used is A=Pe rt where e is a constant and equals approximately 2.7183. Calculate A with continuous compounding. Round answer to nearest cent. deposit is 2,000 for 5 years of 8% I'm not sure if I use the answer I received from the previous question or use the deposit,years and percent. Click here to see answer by checkley77(12569)

 Question 208079: if a bank compounds continuously then the formula used is A=Pe rt where e is a constant and equals approximately 2.7183. Calculate A with continous compounding. Round your answer to the nearest cent. Click here to see answer by checkley77(12569)

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