Questions on Algebra: Logarithm answered by real tutors!

Tutors Answer Your Questions about logarithm (FREE)

Question 77565: log x - log(x+1)= 4
and
ln 3 + ln x= 15
Click here to see answer by stanbon(57290)

Question 77742: help solve this: (5x-6)=ln(3-x)
Click here to see answer by stanbon(57290)

Question 78062: -i wasn't sure of how to type in logarithms, i hope you can understand this:
-What is the real value of x in the equation log(base=2 argument=24) - log(base=2 argument=3) = log (base=5 argument=x)?
-i am preparing for the ACT and we haven't covered logarithms yet. i am trying to learn how to find logarithms, but i still do not understand how to find the value of x.
Click here to see answer by scott8148(6628)

Question 77926: I just can't seem to remember where to input my facts.
my problem is
log with base b 65 &
log with base b (13/5)
use the fact that log with base b5 is .8271 &
log with base b is 1.3181 to evaluate the expression.
How can I remember how to do this? Thanks in advance!!
Click here to see answer by scott8148(6628)

Question 78142: Please help me solve this equation. . I tried bringing the foil method bringing with , but all I ended up with was and my teacher said that my steps were wrong. Can you help me to find out where it is exactly I went wrong.
Click here to see answer by jim_thompson5910(28545)

Question 78144: please help solve the following problem for the varible x:
i know the answer is 4 but i don't know how to get it.
log(x+21)+log(x)=2
Click here to see answer by bucky(2189)

Question 78212: log x + log (x - 3) = 2log2
Click here to see answer by Edwin McCravy(8901)

Question 78304: Suppose that you have a formula to measure the loudness of sounds on a logarithmic scale. You do not know what base to use for your logarithms, but you have determined by experiment that log(b)2=3.4 and log(b)3=5.4. Use this information and the properties of logarithms to calculate log(b)24.
thank in advance
Click here to see answer by stanbon(57290)

Question 78432: Expression 1: 2log(x+1)
Expression 2: 2log(2+x)
Expression 3: 4+log2+3logx
How would the sum of these 3 expressions be written as a single logarithm?
thanks in advance

Click here to see answer by stanbon(57290)

Question 78593: Please help me with this problem!
log5 16-log5 2t=log5 2
Click here to see answer by tutor_paul(490)

Question 78651: find a so that the graph of f(x) =LOGA ^ XCONTAINS THE POINT (21,4)
A=
Click here to see answer by stanbon(57290)

Question 78710: How do u solve this problem
A top-quality fax-copying machine is purchased for $5800. After t years its value is given by the exponential function V(t)=5800(.8)to the power of t .
The company decides to replace the machine when its value declined to $500. After how long will the machine be replaced?

Click here to see answer by stanbon(57290)

Question 78709: How do u solve this question?
A study monitored the life spans of 129 robins over 4 years. The equation was developed to calculate the number of years y for x percent of the robin population to die.

y= 2-log(100-x)/.42
How many robins had died after 6 months?

Click here to see answer by stanbon(57290)

Question 78707: How do u solve log (base 5)(x+4)+ log(base 5)(x-4)=2
I thought about combing the logs but i don't no what to do with the rest of the problem.
Click here to see answer by jim_thompson5910(28545)

Question 78708: How do u solve this question?
A study monitored the life spans of 129 robins over 4 years. The equation was developed to calculate the number of years y for x percent of the robin population to die.

y= 2-log(100-x)/.42
How many robins had died after 6 months?

Click here to see answer by ankor@dixie-net.com(15646)

Question 78742: lnx+ln(x+2)=4
Click here to see answer by bucky(2189)

Question 78743: lnx+ln(x+2)=4
Click here to see answer by Edwin McCravy(8901)

Question 78594: -log(4.9 x 10^(-5))
Much appreciated!
Click here to see answer by tutor_paul(490)

Question 78650: Simplify the logarithmic expression. Express powers as factors.
log6^z^2 =
Click here to see answer by tutor_paul(490)

Question 78798: 2log2-log6
Click here to see answer by stanbon(57290)

Question 79061: (log subscript a b)(log subscript b c)(log subscript c a)
use the change-of-base formula to find the value
Click here to see answer by fetter6(6)

Question 79059: log3(x^2-1)=1

hint:3 is a subscript
solve for x

Click here to see answer by funmath(2925)

Question 79058: 6^x+1=36^x-3
solve for x
Click here to see answer by funmath(2925)

Question 79057: write 2/3 log 64-3 log 2 as a single log
Click here to see answer by funmath(2925)

Question 79062: solve equation
e^(x+4)=6

Thnaks
Click here to see answer by rapaljer(4667)

Question 79062: solve equation
e^(x+4)=6

Thnaks
Click here to see answer by funmath(2925)

Question 79056: write log 2+log 3.5 into a single log
Click here to see answer by funmath(2925)

Question 79109: logx+log14
Click here to see answer by scott8148(6628)

Question 79246: please solve: antilog of 59 to the base e
Click here to see answer by stanbon(57290)

Question 79408: given that log3 4=1.2619 and log3 5=1.4650
find log3 100
and find log3 1.25
given that log3 4=1.2619 and log3 5=1.4650
find log3 100
and find log3 1.25
given that log3 4=1.2619 and log3 5=1.4650
find log3 100
and find log3 1.25
given that log3 4=1.2619 and log3 5=1.4650
find log3 100
and find log3 1.25
given that log3 4=1.2619 and log3 5=1.4650
find log3 100
and find log3 1.25
I'm studying my review for my final test and i'm not sure how to do theses..please help!!
Click here to see answer by stanbon(57290)

Question 79515: The amount A in an account after t years from an initial principle P invested at an annual rate r compounded continuously is given by A=Pe^r^t where r is expressed as a decimal. How many years will it take an initial investment of $1,000 to grow to $1,700 at the rate of 4.42% compounded continuously?
Click here to see answer by stanbon(57290)

Question 79558: I am trying to figure out this question. ln(x+1)= ln(3x+1)-ln x??? I keep getting x= square root 2x+1. but I don't think that is write??? I am horrible at these. Please help!!!
Click here to see answer by stanbon(57290)

Question 79561: Can anyone tell me the correct answer to this prob?? log(x-9)+log 100x = 3??
I keep getting .12 but when I plug it back into the problem it doesn't work. Thanks so much for your help.
Click here to see answer by Earlsdon(6287)

Question 79520: The decibel level of sound is given by D=10log(I/10^-12), where I is the sound intensity measured in watts per square meter. Find the decibel level of a whisper at an intensity of 5.4*10^-10 watts per square meter.
Click here to see answer by ankor@dixie-net.com(15646)

Question 79517: The amount of a radioactive tracer remaining after t days is given by A=Aoe^-0.058t, where Ao is the starting amount at the beginning of the time period. How many days will it take for one half of the original amount to decay?
Click here to see answer by ankor@dixie-net.com(15646)

Question 79779: log(Base3)(x-1) -Log(base3)(x+2)=2
Click here to see answer by rapaljer(4667)

Question 79876: Log(base4)(2x+1)=Log(base4)(x-3)+Log(base4)(x+5)
Click here to see answer by Nate(3500)

Question 79875: ln(x+4)-ln(x+1)=lnx
Click here to see answer by Nate(3500)

Question 79927: Simplify 0.001^(log2)...... what i think i need to do is just punch in the calculator log2 and then solve it, but my teacher wants to see me show my work. I hope you can help me, and lastly thank you!
Click here to see answer by bucky(2189)

Question 80061: (1/2)log(base 6)(16x)=3
Click here to see answer by Earlsdon(6287)

Question 80095: Solve the logarithmic equation log x + log (x-3)= 1
Click here to see answer by Edwin McCravy(8901)

Question 80120: if F is one-to-one- i need to find an equation for its inverse
f(x)=3x^3-4
Click here to see answer by stanbon(57290)

Question 80133: if F is one-to-one, find equation for its inverse
f(x)=(x-8)^2
Click here to see answer by funmath(2925)

Question 80132: if one-to-one, find equation for its inverse
f(x)=3x-6
Click here to see answer by stanbon(57290)

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