Questions on Algebra: Logarithm answered by real tutors!

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Question 172546: Write the following logarithms in termd of commom logarithms
log8 15
Ln30
Click here to see answer by stanbon(57379)

Question 172549: Solve the following loarithmic equations
log(x-5)=2
5+log2x=6
Click here to see answer by Alan3354(30993)

Question 172548: Solve the following for x
2^x=32
3^x-2=81
4^x=1/64
Click here to see answer by jojo14344(1512)

Question 172571: Write the following expressions as the logarithm of a single quantitiy
lnx+ lny-ln5
2ln8+ 5lnx
Click here to see answer by stanbon(57379)

Question 172575: approximate the following logarithms using the properties of logarithms given logb2=0.3562,logb3=0.5646,logb5=0.8271:
logb2/5
logb5b
logb30
Click here to see answer by stanbon(57379)

Question 172573: solve the following logarithmic equation
log(x-5)=2
5+log2x=6
Click here to see answer by stanbon(57379)

Question 172572: solve the following for x
2^x=32
3^x-2=81
4^x=1/64
Click here to see answer by stanbon(57379)

Question 172588: 1/3logbX + 3logbY - 4logbX =
Click here to see answer by Alan3354(30993)

Question 172589: USE THE PROPERTIES OFLOGARITHMS TO WRITE THE FOLLOWING AS A SUM, DIFFERENCE,AND OR MULTIPLE OF LOGARITHMS:
LOG78x
log5 y/x
log 4 x^5
Click here to see answer by stanbon(57379)

Question 172590: Evaluate the following expressions:
log7 49
log2 1/32

ln 1/e^2
log10 0.001
Click here to see answer by KnightOwlTutor(293)

Question 172544: Evaluate the following expressions
log7 49
log2 1/32
ln 1/e2
log10 0.001

Click here to see answer by Alan3354(30993)

Question 172602: choose the expression equivalent to log(2x^3/y^4)
a (log 2 * log(x^3)/ 4 log y)
b (3 log(2x)/log 4 - log y)
c log 3 + log(2x)-log 4- log y
d log 2 + 3 log x - 4 log y
Click here to see answer by Alan3354(30993)

Question 172621: solve and express answer in terms of e
5 + 3 ln x =17
Click here to see answer by stanbon(57379)

Question 172610: solve for x
log4(x-6)+log4x=2
log base 4 (x-6)+log base 4 x=2
Click here to see answer by Electrified_Levi(103)

Question 172613: ln(log(x)-2)=5 Solve for x.
ln(a+b)+ln(a-b)-2lnc Use rules of logs to combine the expression.

Click here to see answer by Alan3354(30993)

Question 172658: 2log9x=log9(5x-4)

Click here to see answer by nerdybill(6962)

Question 172714: 2352 = 3e^(.047x)
good luck
Click here to see answer by KnightOwlTutor(293)

Question 172715: ln 9.3 = ln e^(.047x)
Click here to see answer by KnightOwlTutor(293)

Question 172752: Please help!
1. Convert the following equations into logarithmic form:
a. 6 = 2x
b. 9 = 6y
c. 7 = 3y
d. X = 5y
Click here to see answer by Alan3354(30993)

Question 172750: Can someone please help me!
4. You have $760,000 in your bank account. The interest rate in your account is 5%. Solve for the following:
a. How much interest will you accumulate if interest is compounded annually over the next five years?
b. How much interest will you earn in your account over the next five years with continuous compounding?
You can use a scientific calculator or the =Exp() function in Microsoft Excel.
Click here to see answer by jojo14344(1512)

Question 172749: Please help!
2. Convert the following equations into exponential form:
a. X = log38
b. -9 = log5Y
c. X= log6Y
d. 100 = log2Z
Click here to see answer by Alan3354(30993)

Question 172751: Please help me!
3. Simplify the following expressions:
a. X4 * X5
b. Z9/Z10
c. log3Y + log3Z
d. log5Y - log5Z
Click here to see answer by monika_p(71)

Question 172744: (2/3) log(8) 2^3 =X
Click here to see answer by Alan3354(30993)

Question 172817: 3Log(4)x = Log(4)8
Click here to see answer by nerdybill(6962)

Question 172821: log(2) (x^2 - 1) = 3
Click here to see answer by nerdybill(6962)

Question 172820: Log(2) (x-8) + Log(2) (x+4) = 5
Click here to see answer by nerdybill(6962)

Question 172820: Log(2) (x-8) + Log(2) (x+4) = 5
Click here to see answer by Alan3354(30993)

Question 172820: Log(2) (x-8) + Log(2) (x+4) = 5
Click here to see answer by josmiceli(9697)

Question 172822: i need to graph:
log(-x) Y = 4
Click here to see answer by Alan3354(30993)

Question 172816: Log(3) 5 + Log(3) 4 = Log(x) 3
Click here to see answer by Alan3354(30993)

Question 172874: Solve for x: log(x - 3) = (log x - log 2)
Click here to see answer by nerdybill(6962)

Question 172872: I tried these problems but I'm not sure if they're right. There were 3 parts, or 3 different equations to solve rather. part a) ln(x-4) + ln(2x) = ln(6). first i distributed the ln to the (x-4) and came up with ln(x) - ln(4) + ln(2x) = ln(6). I dont know if this is possible, but then i canceled out all of the lns and was left with 3x=10, meaning x=10/3.
partb) e^2x-7 = 9. I know you have to take the ln of each side, but then i got stuck after i put the exponent as the coefficient leaving me with 2x-7lne = ln9
partc) log (9x+5) - log3 =2. not sure how to do this one.
Click here to see answer by Earlsdon(6287)

Question 172743: log(3) 5 + log(3) 4 = log(x) 3
Thanks a bunch
Click here to see answer by Alan3354(30993)

Question 172868: Log(2) (x^2-1) = 3
Click here to see answer by Alan3354(30993)

Question 172950: Approximate the following logarithms using the properties of logarithms, given logb 2=0.3562, logb 3=0.5646, logb 5 =0.8271.
A. logb 18
B. logb 6b
c. logb 5/2
Click here to see answer by josmiceli(9697)

Question 172951: Solve the following logarithmic equations:
log3 (x-5)=2

5+log4 2x=7
Click here to see answer by nerdybill(6962)

Question 172962: I would like to get some assistance with this question. Give an example of an exponential function. Convert this exponential function to a logarithmic function. Plot the graph.
thank you
Click here to see answer by solver91311(16897)

Question 172949: Evaluate the following expressions:
log3 81
log5 1/25
ln e^4
log.01
Click here to see answer by solver91311(16897)

Question 172949: Evaluate the following expressions:
log3 81
log5 1/25
ln e^4
log.01
Click here to see answer by Earlsdon(6287)

Question 170503: Log (sub b=5) 25 solve without using a calculator

Click here to see answer by Alan3354(30993)

Question 172983: express in condensed form:
4 Ln (sqrt x^3)- 5 Ln (5th root y^4)
Click here to see answer by nerdybill(6962)

Question 172996: Evaluate the logarithm please:

I think the correct answer is 5, based on the rule of logarithms and exponents, but not sure. Thanks.
Click here to see answer by Alan3354(30993)

Question 172997:
Click here to see answer by Alan3354(30993)

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