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Monday, January 24, 2011

SECOND CHANCE!!

I really expect to get some questions... the test on Friday will be just as tough as the test last week!!

hw #6-5 Due Weds Jan 26

click here for the ==> SPECIAL Distributive Property Worksheet

fyi... answers to the ODDS are included! (you're welcome!)
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23 comments:

  1. Maggie JJanuary 24, 2011 at 7:07 PM

    I don't get how to do #21 on the test.
    -Maggie

    ReplyDelete
  2. Mr. ChamberlainJanuary 24, 2011 at 8:20 PM

    Jessica added 120 to one-third of a number for a result of 200. What is the number?

    OK, let's talk it out.

    Do you know the number?
    Of course not, that's why it's a problem.
    So let's call the number 'n'

    Now you try to set up an equation and I'll be back.

    ReplyDelete
  3. AnonymousJanuary 24, 2011 at 8:38 PM

    Oh HAHA. I got the same thing wrong and we probably did the same thing! I will begin by showing the correct way to answer the problem, and then you can write back what you did and we can see what you did wrong.

    Jessica added 120, to 1/3 of a number for a result of 200. What is the number?

    First you should set up an equation:
    120 + 1/3 x = 200

    next you should take care of the constant(s)
    120 + 1/3x = 200
    -120 -120
    Gives you
    x 1/3 = 80

    This is where you might have messed up, just as I did:

    What you probably did is multiply by 0.33

    What you should have done, is multiply by BOTH SIDES 3, so the annoying denominator goes away.
    That leaves you with
    x1 or x = 80(3)
    so x = 240


    Ayaaz :p :)

    ReplyDelete
  4. AnonymousJanuary 24, 2011 at 8:42 PM

    Oooops! I'm sorry Mr. Chamberlain. I was typing my response while you posted yours.

    Ayaaz

    ReplyDelete
  5. Maggie JJanuary 24, 2011 at 9:12 PM

    I did problem #14 on the homework, but I can't get the check step. And I'm having trouble on #16.
    -Maggie

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  6. Maggie JJanuary 24, 2011 at 9:18 PM

    Ok, I get #21 on the test now thanks Mr. Chamberlain and Ayaaz.
    -Maggie

    ReplyDelete
  7. Mr. ChamberlainJanuary 24, 2011 at 10:09 PM

    What are your first steps in #14 & #16?

    ReplyDelete
  8. Mr. ChamberlainJanuary 24, 2011 at 10:11 PM

    fyi, we will review the word problems in class on Weds, too!

    ReplyDelete
  9. AnonymousJanuary 25, 2011 at 7:59 PM

    having trouble distributing da negative test ?5 and hw 14

    luke

    ReplyDelete
  10. Maggie JJanuary 25, 2011 at 8:03 PM

    I got #14, I wasn't thinking correctly.
    The first step for #16 would be 3x-3= -3-3x, then add 3x to both sides. I got 6x-3= -3, then I added 3 to both sides and got 6x=0.
    -Maggie

    ReplyDelete
  11. Mr. ChamberlainJanuary 25, 2011 at 9:49 PM

    Hi Luke,

    We'll definitely go over those in class tomorrow.

    Looks like you are having trouble with something like

    a) 10-(-4x+3) than with

    b) 10-2(-4x+3)

    I think it's because you don't SEE a coefficient. You can look a) a different way...

    10-1(-4x+3)

    Now, you SEE the coefficient of -1.

    Let me know if that helps.

    Mr. C.

    ReplyDelete
  12. Mr. ChamberlainJanuary 25, 2011 at 9:50 PM

    Hi Maggie,

    Ok, so now you have

    6x=0

    just divide both sides by 6 and...

    x=0

    right?

    ReplyDelete
  13. AnonymousJanuary 26, 2011 at 7:12 PM

    Mr. chamberlain i am having trouble getting the sign changes like if the problem has a - and the answer somehow pulls a + out of nowhere. If u could explain that to me it would help thanks

    ReplyDelete
  14. Mr. ChamberlainJanuary 26, 2011 at 7:32 PM

    Could you post a sample problem... nothing comes from nowhere... the math gods won't hear of it!

    ReplyDelete
  15. AnonymousJanuary 26, 2011 at 7:42 PM

    like in the pre-test sheet theres a problem #5 and it says -2(1-9x)+4x and when you go through it it ends up -2(1) – 2(9x) + 4x and then -2 + 18x + 4x the first plus sign wasn't even in the equation where did it come from?

    ReplyDelete
  16. Mr. ChamberlainJanuary 26, 2011 at 7:50 PM

    Well, here is where we use some of knowledge of mathematical properties. (I know that you know that) the Additive Inverse property allows us to re-write subtraction as addition by ADDING THE OPPOSITE. So let's invoke the property:

    -2(1-9x)+4x ... becomes
    -2(1+(-9x))+4x ... do you agree?
    ... next, we'll distribute the -2
    -2(1) + (-2)(-9x) + 4x ... right??
    -2 + 18x + 4x .... then CombLikeTerms
    -2 + 22x

    Ca-peesh??

    ReplyDelete
  17. AnonymousJanuary 26, 2011 at 7:55 PM

    ok thanks ca-peesh!
    -Jess

    ReplyDelete
  18. AnonymousJanuary 30, 2011 at 3:53 PM

    I have a question about problem 24 To what decimal place should we round the cost to rent a video game for Kyle

    ReplyDelete
  19. Mr. ChamberlainJanuary 30, 2011 at 4:25 PM

    First off, I'm little surprised that the problem requires rounding...

    If it does... well, to what number of decimal points can Kyle pay? Does that help?

    problem 24 where?

    ReplyDelete
  20. AnonymousJanuary 30, 2011 at 4:52 PM

    Sorry I wasn't specific on the test problem 24 I rounded to the nearest hundredth.Maybe I didn't do the problem right.My answer was It cost 2.81 to rent a video game.


    Kyle

    ReplyDelete
  21. Mr. ChamberlainJanuary 30, 2011 at 4:59 PM

    Here is the problem:

    At video shack, movie rentals cost $3.75 each. The cost of three movie rentals and one video game is $0.55 less than the cost of five video game rentals. How much does it cost to rent a single video game?

    How did you define the unknown variable?
    What was your starting equation?

    ReplyDelete
  22. AnonymousJanuary 30, 2011 at 5:19 PM

    My equation was 3.75 x 3 + v=5v-0.55

    ReplyDelete
  23. Mr. ChamberlainJanuary 30, 2011 at 5:58 PM

    NEVER USE A MULTIPLICATION 'x'... even when blogging!!

    I'll re-state your equation as 3(3.75)+v=5v-0.55

    That's a good start... what did you do next?

    (ps - your solution of 2.81 was wrong)

    ReplyDelete

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