The Maths Thread - Page 4

Craig · 30-08-2005, 03:06 AM

Quote:

Originally Posted by marc71178

And the accountants leave it to the Tax geeks...

And if I were the tax geek I would say do it yourself.

Craig · 30-08-2005, 03:08 AM

Quote:

Originally Posted by aussie

Here is one of the most complicated things i've ever done in maths its so confusing

FH (X) = 2X - 3
X +4

Find A: H (-3)
B: H(1/2)
C: H(5)

D: Calculate the value for X if (1): H(X) = 3
(2): H(X) is undefined

I'm stumped.

Paid The Umpire · 30-08-2005, 04:01 AM

Thanks. I am great!

Prince EWS · 30-08-2005, 04:11 AM

It looks pretty simple to me actually.

Just looks like substitution. The last one was a bit trickier (the unknown one) but it just involved fidding around with the equation to change the subject.

Burpey · 30-08-2005, 04:47 AM

Quote:

Originally Posted by Paid The Umpire

A ---> x = -1.8
B ---> x = 5 and a third
C ---> x = -5 and two thirds
Da ---> x = -15
Db ---> x = (3 + 4H(X)) over (2 - H(X))

I thinks...

Is this right? Cos I got totally different answers ... maybe I am on the wrong wavelength. It was hard to decipher what Aussie meant though. Too bad he's not here to clarify ...

Prince EWS · 30-08-2005, 04:58 AM

Quote:

Originally Posted by burkey_1988

Is this right? Cos I got totally different answers ... maybe I am on the wrong wavelength. It was hard to decipher what Aussie meant though. Too bad he's not here to clarify ...

Yeah... I got -9 for the first one...

Burpey · 30-08-2005, 05:05 AM

Quote:

Originally Posted by aussie

Here is one of the most complicated things i've ever done in maths its so confusing

FH (X) = 2X - 3
X +4

Find A: H (-3)
B: H(1/2)
C: H(5)

D: Calculate the value for X if (1): H(X) = 3
(2): H(X) is undefined

My answers:

A: -9
B: -4/9
C: 7/9
D: (1) -15
(2) -4

Maths experts, am I correct?

Buddhmaster · 30-08-2005, 05:21 AM

Woah, I have no idea what's going on.

twctopcat · 30-08-2005, 05:23 AM

My answers:

A) -9
B) -4/9
C) 7/9
D) 1. -15

3. X = (3+4y)/(2-y)

Burpey · 30-08-2005, 05:27 AM

Isn't D (2) X=-4 ... to be undefined to denominator has to be zero. Therefore, when X = -4 the denominator is zero

Neil Pickup · 30-08-2005, 05:40 AM

Quote:

Originally Posted by twctopcat

I did Econometric Methods in the second year, taught by Cherif Guermat, what a man!! Never really worked out the difference between the 2 but i know they should be worth double most other modules. Brilliant stuff with the 77 though, your a better man than me! You on for a first then??

Yep - 75 in Macro and 100 in Micro (and 61 in French) - average of 78.25 and well on for a good first

sledger · 30-08-2005, 06:17 AM

how long is aussie banned for ?

twctopcat · 30-08-2005, 06:30 AM

Quote:

Originally Posted by Neil Pickup

Yep - 75 in Macro and 100 in Micro (and 61 in French) - average of 78.25 and well on for a good first

100 in micro, my mate got in the 90's and i thought he was good! Fair play!

marc71178 · 30-08-2005, 11:07 AM

Quote:

Originally Posted by Craig

And if I were the tax geek I would say do it yourself.

No, the tax geeks actually enjoy it!

Neil Pickup · 30-08-2005, 11:38 AM

I can confirm that Burkey is right on all counts.

Basically what it means is:
To calculate H given a set value of X, just do: (2x-3)/(x+4)

If X=-3, then H=(-9)/(1) = -9
If X=0.5, then H=(-2)/(-4.5) = -0.44 or -4/9
If X=5, then H=(7)/(9) = 0.78 or 7/9

For the next part, you need (2x-3)/(x+4) to equal three.
Multiplying both sides by (x+4) gives you (2x-3) = 3(x+4)
Expansion gives 2x-3 = 3x+12
Collecting like terms gives you x=-15

The last part is the easiest. For a fraction to be undefined, the bottom (denominator) has to be zero. So... (x+4) = 0 - and x = -4

30-08-2005, 04:01 AM	#48 (permalink)
Paid The Umpire All Time Legend Join Date: Mar 2002 Location: In Your House, With A Knife! Posts: 2,300	Thanks. I am great! __________________ JOIN the CRICKETWEB.NET STEAM GROUP

30-08-2005, 04:11 AM	#49 (permalink)
Prince EWS Global Moderator Join Date: Jul 2003 Location: New South Wales Posts: 37,731	It looks pretty simple to me actually. Just looks like substitution. The last one was a bit trickier (the unknown one) but it just involved fidding around with the equation to change the subject. __________________ ~ Cribbage

30-08-2005, 05:23 AM	#54 (permalink)
twctopcat International Regular Join Date: Jan 2004 Location: winchester, england Posts: 3,477	My answers: A) -9 B) -4/9 C) 7/9 D) 1. -15 3. X = (3+4y)/(2-y) __________________ R.I.P Fardin Qayyumi (Cricket Player) 'Last one on drugs is a queer,' yells portillo.. Hope is a good thing, maybe even the best of things. And no good thing ever dies...... Self appointed president of the KPPAS

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30-08-2005, 05:21 AM	#53 (permalink)
Buddhmaster International Captain Join Date: Oct 2004 Location: Same place as the Ashes Posts: 5,615	Woah, I have no idea what's going on.

30-08-2005, 05:27 AM	#55 (permalink)
Burpey Cricketer Of The Year Join Date: Jan 2005 Location: Sydney Posts: 7,584	Isn't D (2) X=-4 ... to be undefined to denominator has to be zero. Therefore, when X = -4 the denominator is zero

30-08-2005, 06:17 AM	#57 (permalink)
sledger Spanish_Vicente Join Date: Aug 2004 Location: cricsim, lol Posts: 28,134	how long is aussie banned for ?

30-08-2005, 11:38 AM	#60 (permalink)
Neil Pickup Cricket Web Staff Member / Global Moderator Join Date: Mar 2002 Location: Oxford, England Posts: 26,361	I can confirm that Burkey is right on all counts. Basically what it means is: To calculate H given a set value of X, just do: (2x-3)/(x+4) If X=-3, then H=(-9)/(1) = -9 If X=0.5, then H=(-2)/(-4.5) = -0.44 or -4/9 If X=5, then H=(7)/(9) = 0.78 or 7/9 For the next part, you need (2x-3)/(x+4) to equal three. Multiplying both sides by (x+4) gives you (2x-3) = 3(x+4) Expansion gives 2x-3 = 3x+12 Collecting like terms gives you x=-15 The last part is the easiest. For a fraction to be undefined, the bottom (denominator) has to be zero. So... (x+4) = 0 - and x = -4

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