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Browse High School Logarithms
Stars indicate particularly interesting answers or
good places to begin browsing
 No Logarithm of a Negative Number [8/6/1996]

log(5) = ?
 Origin of the Term Logarithm [10/27/1999]

Where does the term logarithm come from?
 Perfect Logarithms [06/24/2002]

What can you tell me about the equation log(abc)= log(a+b+c)?
 Population Growth Rate [9/5/1996]

If a population increases from 10 million to 300 million in 10,000 years,
what is the annual growth rate?
 Population of China [05/13/1997]

If the population growth rate of China is 4.3 percent and the current
population of the country is 1.27 billion people, when will the
population reach 2 billion?
 Proof by Contradiction [05/09/2003]

Show that the log_2(7)/log_2(6) is irrational.
 Radioactive Decay [10/26/2004]

The halflife of a radioactive element is 131 days, but your sample
will not be useful to you after 90% of the radioactive nuclei
originally present have disintegrated. For about how many days can you
use the sample?
 Repeated Square Roots and Logarithms [04/05/2005]

A discussion based on a calculator trick where taking 'n' repeated
square roots of 'a', then subtracting 1 and multiplying by 'b', then
adding 1 and squaring 'n' times, leads to a result very close to a^b.
The explanation is closely related to logarithms.
 Resolving Decimal Exponents [03/26/2001]

How can you find 7^.3 or 5^.6 without using a calculator? Is there more
than one way of doing this?
 Richter magnitude problem [11/23/1994]

The Richter magnitude, R, of an earthquake is given by R=0.67
log(0.37E)+1.46 where E is the energy in kW*h released by the earthquake.
Show that if R increases by 1 unit, E increases by a factor of about 31.
 Roughing It More Rigorously [12/02/2010]

A physics student wants to make sense of the various symbols used to represent "approximately equal to"  as well as the phrase's mathematical meaning. Doctor Vogler produces two precise definitions while acknowledging that context, and personal preference, rule the day.
 Seventytwo and 115: What Do Logs Have to Do with Doubling and Tripling Your Money? [02/19/2010]

Doctor Carter uses logarithms and the Taylor series to show where the
72 in the "law of 72" comes from  and shows how the same interest
rate calculations yield 115/I as an approximation for the number of
years it takes an investment that bears I interest rate to triple in
value.
 Slide Rules [03/13/1999]

Can you help me learn how to use a slide rule?
 Solving a Decibel Noise Equation [05/23/2000]

How do you rearrange the formula 50 = 94.5  20log(r)  8 to solve for r?
 Solving a Logarithm Equation by Substitution [12/18/2007]

I'm learning about logs, and had to solve (x+1)^(log(x+1)) = 100(x+1).
My answers don't check. Can you show me where I went wrong?
 Solving Logarithm Equations [04/29/2001]

How can I solve the equation: log_7(x) / log_7(4)  log_7(y) = 1, for y?
 Solving Logarithms with the Quotient Rule [11/11/1998]

Can you help me solve this logarithm problem for x? I think you need to
use the quotient law.
 Solving Log Equation [04/20/2008]

Given log(x) + log(x + log(x)) + log(x + log(x) + log[x + log(x)]) =
0, how can I solve for x?
 Solving Logistic Equations for a Variable in the Exponent [05/03/1998]

Using natural logarithms to solve for the time variable in two logisitic
growth equations.
 The Symbol for Natural Log [06/28/2000]

Why is "ln" and not "nl" the abbreviation for natural log?
 Taking the Logarithm of Zero [08/11/2004]

Why is log(0) undefined?
 Uses of Logarithms [07/20/2002]

Who uses logarithms, and for what?
 Using a Rule of Logarithms [9/13/1995]

I can't figure out this problem. Can you help? log(sub)2 3k+log(sub)2
5=log(sub)2 45.
 Using Logarithms to Find Number of Digits in Large Numbers [06/25/2007]

How many digits are there in 8^1000? What power of 8 has 1000 digits?
What number to the 1000th power has 500 digits?
 What Does x Equal? [01/16/1998]

32 * 4^2x = 12. What is x? What is a logarithm?
 Why Do We Learn Logarithms? [02/28/2005]

I am currently studying logarithms in school and I was wondering what
the point of them is. Will we ever use them when we grow up, and how
are they used in real life?
 Why Use a Logarithmic Scale to Display Data? [01/26/2008]

I read that log scales help you see data when you are looking at
values that range largely. I also read that if the ear did not hear
logarithmically we would only hear very loud sounds. Can you help me
understand these two statements?
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