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Homework Help
Posted: 02 Jun 2008 22:49
by Pwneress
Post any problems you are having here, our lovely intelligent members will most likely help out
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anything!
math help!
Posted: 02 Jun 2008 23:19
by hshiau
first one is sphere. second is height. i think.
Re: math help!
Posted: 26 Jun 2008 15:02
by Pwneress
^thanks for helping me like forever ago anyway....
more help anyone please?
Write the equation and solve....
The sum of three times a number and 7 more than the number is the same as the difference between -11 and twice the number. what is the number?
In the 2004-2005 NBA regular season, the Phoenix Suns won two more than three times as many games as they lost, The Suns played 82 games. How many wins and losses did the team have?
Re: math help!
Posted: 26 Jun 2008 15:32
by decadence21
The first one is -3
3x+x+7= -11-2x
4x+7 = -11-2x
+11 +11
4x+18= -2x
-4x -4x
18= -6x
/-6 /-6
-3=x
Re: math help!
Posted: 26 Jun 2008 15:37
by Pwneress
thanks very much=)
I got help on evthreads too,I swear some people are just so friendly =]
Re: math help!
Posted: 26 Jun 2008 15:39
by Kemmy
I will try to explain it the best I can...
Example 2: 3x + x + 2 = 82
4x = 82-2
4x = 80
x = 20
If you plug it back in to verify: 3(20) + (20) + 2 = 60 + 20 + 2 = 82
Re: math help!
Posted: 26 Jun 2008 15:42
by decadence21
The Basketball one...
Equation form
L=losses
3L+2=wins
L+3L+2=82
4L+2=82
-2 -2
4L=80
/4 /4
L=20
__________________
3(20)+2=w
60+2=w
62=w
_______________________
20 losses and 62 wins
Re: math help!
Posted: 26 Jun 2008 15:44
by Kemmy
right, I didn't finish the problem...
^^ just plug in the number (20) into the equations for the wins and losses... thanks Sarah, I forgot
Re: math help!
Posted: 26 Jun 2008 15:45
by decadence21
I love math! Haven't done it in years.
Took a minute, but it's good to know I still have it.
Re: math help!
Posted: 26 Jun 2008 15:52
by Kemmy
haha, same!
Re: math help!
Posted: 26 Jun 2008 22:04
by hshiau
Re: math help!
Posted: 26 Jun 2008 22:35
by Pwneress
^it Is -3 =]
Re: math help!
Posted: 26 Jun 2008 23:40
by hshiau
Re: math help!
Posted: 27 Jun 2008 08:45
by decadence21
3x+x+7= -11-2x
3(2) + 2 + 7 = -11 - 2(2)
6+2+7= -11- 4
15 = -15
Sorry Howard, but doesn't work.
Good try though.
I was worried I messed up.
I haven't done this stuff in years.
Re: math help!
Posted: 27 Jun 2008 11:20
by hshiau
Re: math help!
Posted: 27 Jun 2008 14:42
by decadence21
The mathematical definition of "difference"...
Eleventh one down.
Re: math help!
Posted: 27 Jun 2008 14:55
by hshiau
They give you a definition of a '-' sign, not the other way around. If a, then b. It doesn't necessarily follow that if b, then a. But the real problem is that it doesn't tell you which number to put first - 2x-(-11) or -11-2x. That's really the crux of our differences, no?
Re: math help!
Posted: 27 Jun 2008 15:39
by decadence21
***Friendly debate continues***
I beg to differ. It does matter what order you write the equation.
-11 -(2x2)= -15
(2x2) -(-11)= 15
What's the difference (non-mathematical definition) between a negative number and a positive?
Well... you can look at it this way...
If you have $5 in your bank account and write a check for $6,
which goes through immediately, you are $1 in the hole.
But if you have $6 in the bank, and write a check for $5,
you still have $1 dollar left.
Make any sense?
Re: math help!
Posted: 27 Jun 2008 15:53
by hshiau
absolutely. i definitely think the order makes a difference. however, the word "difference" doesn't necessarily tell you to subtract the second from the first or the first from the second. that's why we got different answers. i found an example online of the dilemma.
http://mathforum.org/library/drmath/view/61649.html
Re: math help!
Posted: 27 Jun 2008 16:30
by decadence21
I see your point. However, that equation was solved assuming all numbers were positive.
In that case, the order of the equations to find the variables is obsolete.
Anyhow, maybe there are 2 answers and we're both right. 
pwneress, maybe you can let us know what your answer is when you turn it in?