Results 1 to 8 of 8

Math Help - [SOLVED] I have a lot of math problems/questions

  1. #1
    Newbie
    Joined
    Jul 2008
    Posts
    10

    [SOLVED] I have a lot of math problems/questions

    1.
    If f(y) = [(the absolute value of y)+16], what is the value of f(-4)?
    I don't understand what exactly to do on this one, can anyone help explain?

    2.
    How many numbers from 1 to 100 inclusive are equal to some integer to the fourth power?
    Same as above, what to do and what are they asking exactly?

    3.
    Minoo had a dinner party and was serving cups of earl grey tea and cups of chamomile tea at a ratio of 5 to 1. Then one of the guests arrived late and started drinking chamomile tea to soothe her nerves after a bad day she had 3 cups, which changed the ratio of earl grey cups and chamomile cups to 5 to 2. How many cups of tea did Minoo serve in all?
    I can try to guess and insert random numbers to figure out this one but what's the faster way(some sort of equation?).

    4.
    3^n = 3^2(n). What is the value of n?
    Again, not sure what to do.

    5.
    If b is positive, what part of 4b is 8?

    Answer:
    a. 4%
    b. b/100%
    c. b/4%
    d. 4/b%
    e. 200/b%
    Same as above.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Hello Forum_User

    welcome to the forum. next time, don't post questions between quote tags, because they don't show up when other users quote you message
    Quote Originally Posted by Forum_User View Post
    1. I don't understand what exactly to do on this one, can anyone help explain?

    If f(y) = [(the absolute value of y)+16], what is the value of f(-4)?
    as with any other function. whatever goes into the brackets, you replace the variable with it in the function definition

    f(y) = |y| + 16

    \Rightarrow f({\color{red}-4}) = |{\color{red}-4}| + 16

    can you continue?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Forum_User View Post
    1. I don't understand what exactly to do on this one, can anyone help explain?

    2. Same as above, what to do and what are they asking exactly?

    3. I can try to guess and insert random numbers to figure out this one but what's the faster way(some sort of equation?).

    4. Again, not sure what to do.

    5.
    Same as above.
    I have time for a couple:

    1. Do you understand the mod function .....? |-4| + 16 = 4 + 16 = 20.

    2. 1^4 = 1, 2^4 = 16, 3^4 = 81, 4^4 = 256, ..... So how many do you think there are?


    4. You need n = 2n (why?). Therefore ...

    5. (8/4b) times 100 = ...... (You times by 100 to convert to a percentage)
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Forum_User View Post
    2. How many numbers from 1 to 100 inclusive are equal to some integer to the fourth power?
    well, you want numbers that you get from raising some integer to the fourth power.

    for example, 16 would be one of the numbers you would select. why? because 16 = 2^4, that is, an integer (namely, 2) raised to the fourth power.

    just start counting them of.

    leave out zero...

    1^4 = 4

    2^4 = 16

    3^4 = 81

    4^4 = 256

    and so on and so fourth. these are the first few integers. do we need to find anymore? which ones would you choose?


    EDIT: Whoah, Bessie! Mr F came out of nowhere and answered all the questions. well, he left out number 3... don't know if he's gonna do it... are you, Mr F?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Hmmm, seems Mr F left...
    Quote Originally Posted by Forum_User View Post
    3. Minoo had a dinner party and was serving cups of earl grey tea and cups of chamomile tea at a ratio of 5 to 1. Then one of the guests arrived late and started drinking chamomile tea to soothe her nerves after a bad day she had 3 cups, which changed the ratio of earl grey cups and chamomile cups to 5 to 2. How many cups of tea did Minoo serve in all?
    ok, let g be the number of cups of Earl Grey tea served before the late guest got there, and c be the number of cups of Charmomile tea served before the late guest got there

    we have 5 times as many g as we do c, since the ratio is 5:1. now, ratios can be written as fractions, so lets do that to develop our equation.

    g:c is 5:1

    \Rightarrow \frac gc = \frac 51

    \Rightarrow g = 5c ..........5 times as many g as c, our equation makes sense

    now, when 3 more cups of c are served, the ratio goes from 5:1 to 5:2

    that is, g:c + 3 is 5:2

    or in other words:

    \frac g{c + 3} = \frac 52

    but g = 5c, thus we have:

    \frac {5c}{c + 3} = \frac 52

    now you can solve for c. once you have c, it is easy to find g. once you have c and g, you can find out how many cups were served in all

    good luck
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Jul 2008
    Posts
    10
    Thanks for the help everyone. I understand the questions now, though I haven't tried out answering the questions again yet. I'll try out the solutions later, I am literally having kind of a headache trying to figure out all this math.

    Thing is, I haven't done math in a looooong time and I vaguely remember what to do with some of the math problems which is why I need a math break for maybe an hour or so before I try out answering all the questions again.

    Thanks again everyone.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Jhevon View Post
    [snip]
    EDIT: Whoah, Bessie! Mr F came out of nowhere and answered all the questions. well, he left out number 3... don't know if he's gonna do it... are you, Mr F?
    I nearly said that I'd come back and do it when I had more time.
    Follow Math Help Forum on Facebook and Google+

  8. #8
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by mr fantastic View Post
    I nearly said that I'd come back and do it when I had more time.


    inside joke
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. How to get better on SAT math questions
    Posted in the Math Topics Forum
    Replies: 18
    Last Post: February 12th 2011, 04:15 AM
  2. Replies: 2
    Last Post: June 2nd 2010, 08:24 PM
  3. Replies: 2
    Last Post: February 15th 2010, 03:09 PM
  4. [SOLVED] Help me to solve this math problems
    Posted in the Algebra Forum
    Replies: 3
    Last Post: August 22nd 2009, 05:42 AM
  5. Replies: 1
    Last Post: March 20th 2007, 12:34 PM

Search Tags


/mathhelpforum @mathhelpforum