« previous next »
Pages: [1]   Go Down

Author Topic: One more math problem to help me with my test!  (Read 1775 times)

0 Members and 1 Guest are viewing this topic.

Offline tjanuranus

  • Posts: 2234
  • Gender: Male
One more math problem to help me with my test!
« on: July 26, 2011, 01:25:02 PM »
Sorry for all the math threads but i have a test in two hours and i'm going over my notes and i don't understand why this is the way it is...

Given log(b6) of 7 = 1.086 and log(b6) of 10 = 1.285 and log(b6) of 2 = .387

Find log(b6) of 35.

What i did was multiplied 1.49 and .565 then divided that answer by 2 to get the answer. But my notes say that's wrong and i don't understand what the notes are saying!

NOTES...

log(b6) of 35 = log(b6) of (10 times 7 / 2)
= log(b6) of 10 + log(b6) of 7 - log(b6) of 2
1.285 + 1.086 - .387

Help?
Logged

Offline Var

  • Gravity Well
  • Posts: 41
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #1 on: July 26, 2011, 01:36:03 PM »
logn(xy/z) = logn(x) + logn(y) - logn(z)

log6(35) = log6(7) + log6(10) - log6(2)

35 = 7 * 10 / 2

Power rules.  Multiplying with the same base is equivalent to adding exponents, dividing is equivalent to subtracting.

Because logarithms are the inverse, adding = multiplying, subtracting = dividing.
Logged

Offline tjanuranus

  • Posts: 2234
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #2 on: July 26, 2011, 01:37:24 PM »
omg ugh i looked over the first step. thank you
Logged

Offline Var

  • Gravity Well
  • Posts: 41
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #3 on: July 26, 2011, 01:43:14 PM »
No problem!
Logged

Offline Nick

  • A doctor.
  • Global Moderator
  • *****
  • Posts: 20053
  • Gender: Male
  • But not the medical kind.
Re: One more math problem to help me with my test!
« Reply #4 on: July 26, 2011, 02:08:56 PM »
Most. Helpful. Noob. Ever.
Logged
For the best online progressive radio: ProgRock.com
For the best in progressive news, reviews, and interviews: SonicPerspectives.com
For a trove of older podcasts and interviews: WPaPU.com
Awesome Majesty Pendant Club: Member #1

Online Jamesman42

  • There you'll find me
  • DT.net Member
  • ***
  • Posts: 21862
  • Spiral OUT
Re: One more math problem to help me with my test!
« Reply #5 on: July 26, 2011, 02:16:51 PM »
mathematixxx
Logged

Offline Var

  • Gravity Well
  • Posts: 41
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #6 on: July 26, 2011, 02:35:49 PM »
Quote from: Nick on July 26, 2011, 02:08:56 PM
Most. Helpful. Noob. Ever.
Logarithms aren't hard. :V

But thanks, I guess?
Logged

Offline Cool Chris

  • DTF.org Alumni
  • ****
  • Posts: 13607
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #7 on: July 26, 2011, 02:36:28 PM »
Math help: Apparently there is no app for that :D
Logged
"Nostalgia is just the ability to forget the things that sucked" - Nelson DeMille, 'Up Country'

Online Jamesman42

  • There you'll find me
  • DT.net Member
  • ***
  • Posts: 21862
  • Spiral OUT
Re: One more math problem to help me with my test!
« Reply #8 on: July 26, 2011, 02:38:33 PM »
Quote from: Var on July 26, 2011, 02:35:49 PM
Logarithms aren't hard. :V

Well, people in general find math hard, when to do what rules. Logarithms are in precalc, a class that not as many people take as well. Trust me on that.

It's not that people can't do it, but it just happens that people either can't grasp it right away, or they have a bad teacher, or they themselves are not putting the effort into trying to understand what is going on.
Logged

Offline adameastment

  • Posts: 365
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #9 on: July 26, 2011, 02:44:35 PM »
Isn't it bad, that after doing these things for the last 2 years. I've completely forgotten what to since doing my exams in July...
Logged

Offline Var

  • Gravity Well
  • Posts: 41
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #10 on: July 26, 2011, 02:50:59 PM »
Quote from: Jamesman on July 26, 2011, 02:38:33 PM
Quote from: Var on July 26, 2011, 02:35:49 PM
Logarithms aren't hard. :V

Well, people in general find math hard, when to do what rules. Logarithms are in precalc, a class that not as many people take as well. Trust me on that.

It's not that people can't do it, but it just happens that people either can't grasp it right away, or they have a bad teacher, or they themselves are not putting the effort into trying to understand what is going on.
Well, actually, I learned about logarithms in Algebra 2, which was a required course in high school.

Logarithms in themselves aren't that hard; it's just that most people don't know what they are or how to use them.  And I don't blame them; you don't really need logs in your daily life, unless you live in Vermont or happen to be doing something math- or science-related.
Logged

Online Jamesman42

  • There you'll find me
  • DT.net Member
  • ***
  • Posts: 21862
  • Spiral OUT
Re: One more math problem to help me with my test!
« Reply #11 on: July 26, 2011, 02:55:22 PM »
Oh yeah duh, you learn them in Algebra 2.  :facepalm: It's been so long since I learned them, and in college people learn them in precalc.
Logged

Offline pmahoney1337

  • Posts: 245
  • Gender: Male
Re: One more math problem to help me with my test!
« Reply #12 on: July 26, 2011, 03:28:28 PM »
Quote from: Jamesman on July 26, 2011, 02:55:22 PM
Oh yeah duh, you learn them in Algebra 2.  :facepalm: It's been so long since I learned them, and in college people learn them in precalc.
I didn't learn them till pre-calc.
Logged

Online Jamesman42

  • There you'll find me
  • DT.net Member
  • ***
  • Posts: 21862
  • Spiral OUT
Re: One more math problem to help me with my test!
« Reply #13 on: July 26, 2011, 03:32:17 PM »
It may also depend on where you live (state), I think.
Logged
Pages: [1]   Go Up
« previous next »