NationStates Jolt Archive

Im doing a maths assignment but i spent most of the week focussing on the calculus and forgot about the algebra. Maths isnt my strong point so if someone could please give me some help??

What level/standard?

Im doing a maths assignment but i spent most of the week focussing on the calculus and forgot about the algebra. Maths isnt my strong point so if someone could please give me some help??

Post the problem in question. I'll give it a shot.

What level/standard?

its last year high school

Will post soon, a chick i no is trying to get a street sign and making a meal of it, gotta go help her as she is pretty hot :D
be back soon.
and thanks

"help me with.......something"

:rolleyes:

Im doing a maths assignment but i spent most of the week focussing on the calculus and forgot about the algebra. Maths isnt my strong point so if someone could please give me some help??

If you need help with algebra why are you doing calculus? Differentiation can require some advanced techniques in algebra, particularly the logarithmic and trigonometric functions. Can you give an example of a question that you need help with?

Sory bout the delay, I uploaded the 2 pages im having difficulty with here (http://www.freewebs.com/beaten_souls/police.htm). (dial up warning, contains couple big pictures)

Any help would be good, btw, i know it says it was due last monday, they gave me an extra week to get it done because i broke my leg and missed a bit of school. Only problem is a week wouldve been heaps to catch up if it was only maths, but with 6 other subjects im a little behind where i should be :(

I thank you greatly for any help. For the first question on the first page i get
(2t+3)(t-1)=0 is this correct?

First is correct.

1:
3 - 2t^2 = t (t != 0)
2t^2 + t - 3 = 0
(2t + 3)(t - 1) = 0
t = -3/2 or 1

Sory bout the delay, I uploaded the 2 pages im having difficulty with here (http://www.freewebs.com/beaten_souls/police.htm). (dial up warning, contains couple big pictures)

Any help would be good, btw, i know it says it was due last monday, they gave me an extra week to get it done because i broke my leg and missed a bit of school. Only problem is a week wouldve been heaps to catch up if it was only maths, but with 6 other subjects im a little behind where i should be :(

I thank you greatly for any help. For the first question on the first page i get
(2t+3)(t-1)=0 is this correct?
yep, correctm t = -1.5 or 1

2b:

1 - 2x = e^2
x = (e^2 - 1)/2

1:
3 - 2t^2 = t (t != 0)
2t^2 + t - 3 = 0
(2t + 3)(t - 1) = 0
t = -3/2 or 1

Sweet, so I got that one :D

I dont have a clue what to do with a natural log graph :confused:

3a:

i:

-3

(-3, 0)

ii:

(2 + j)/(2 - j)(2 + j)
(2 + j)/(4 + 1)
2/5 + j/5

(2/5, 1/5)

iii:

3 + 2j - 3j + 2
5 - j

(5, -1)

2b:

1 - 2x = e^2
x = (e^2 - 1)/2

where did the e come from??

For number 3.

I) 3/(j^2) = 3/(-1) = -3

II) 1/(2-j)
complex conjugate of (2-j) is (2 + j)

1/(2 - j) * (2 + j)/(2 + j) = (2 + j)/3
(2 + j)/3 = 2/3 + (2/3)j

III) (1 - J)(3 + 2j)
use FOIL
= 3 + 2j - 3j - 2j^2
= 3 + (-j) + 2
= 5 - j

4:

x^2 - 3x + 4 = 0

x = ( 3 +- v(3^2 - 4.1.4) )/2.1
x = 3/2 +- jv5/2

5a:

k = 2.3 (ha)

5b:

A = 2.3 * e^0.96 ha

5c:

10 = 2.3 * e^0.02t
e^0.02t = 10/2.3
0.02t = ln(10/2.3)
t = 50ln(10/2.3) hrs

where did the e come from??

2b) they raised e to the power of each side of the equation, so

rhs=e^(ln[1-2x])
=1-2x

and

lhs = e^2

6:

f'(x) = 3cos(x - 0.5)
f'(2) = 3cos(1.5)

2b) they raised e to the power of each side of the equation, so

rhs=e^(ln[1-2x])
=1-2x

and

lhs = e^2

Pretty straightforward.

I'd help too, but it seems you guys pretty much got it covered :)
:gundge: <---fun

2b) they raised e to the power of each side of the equation, so

rhs=e^(ln[1-2x])
=1-2x

and

lhs = e^2

cool, thanks, how do i figure out the graph?

for the graph in 2a?

I never did any maths beyond adding and subtracting...all this stuff scares me :(

Pretty straightforward.

I'd help too, but it seems you guys pretty much got it covered :)
:gundge: <---fun

lol, thanks, i appreciate all the help i can get but all you guys are extrordinary (sp?), i suck at maths, but i spose a broken leg is what u get if ur stupid enuf to ride a motorbike :(

7a:

f'(x) = 3x^2 - 2x - 8

if f'(x) = 0 then
3x^2 - 2x - 8 = 0
(3x - 4)(x + 2) = 0
x = 3/4 or -2

f''(x) = 6x - 2

f''(3/4) > 0

Therefore x = 3/4 is a local minimum

f''(-2) < 0

Therefore x = -2 is a local maximum

for the graph in 2a?

yes

8:

A = 2.3 * e^0.02t (ha)

dA/dt = 0.115 * e^0.02t

At 6 hours, dA/dt = 0.115 * e^0.12 (ha per hour)

9a:

t = 0
s = 5

9b:

ds/dt = 27 - 3t^2

If ds/dt = 0 then t = +-3

(you can see that only t = 3 produces a maximum, and that it is less than the initial, therefore the maximum is 15: work this out yourself)

The riding of the motorbike is cool... :D

Ahh i suck at maths too, managed to get a B last year, so just scraped into my physics course this year, only to get more maths!!!

2a)

umm lets see...

firstly 1-2x is greater than or equal to one, so x is always less than 1/2... someone else...

9c:

s'' = -6t

If s'' = -15ms^s then t = 2.5s


10:

f'(x) = e^-x - x * e^-x
f'(x) = (1 - x) * e^-x

Now, e^-x > 0 for all x, therefore the only turning point is at 1 - x = 0, ie, x = 1

Uh yeah... Advanced Maths major at uni, and am currently studying to become a Maths teacher...

:D

firstly 1-2x is greater than or equal to one, so x is always less than 1/2... someone else...

AHA that means the vertical asymptote is at 1/2!!! and it goes through the origin!! ok getting somewhere

The riding of the motorbike is cool... :D

Ahh i suck at maths too, managed to get a B last year, so just scraped into my physics course this year, only to get more maths!!!

2a)

umm lets see...

firstly 1-2x is greater than or equal to one, so x is always less than 1/2... someone else...

how do you know its less than 1?? surely x could be anything?

but the bike wasnt even good (Honda XR 250), altho i did get hit by a truck (he ran an intersection as he didnt see me) which is kinda cool

Uh yeah... Advanced Maths major at uni, and am currently studying to become a Maths teacher...

:D

Poor guy :P

how do you know its less than 1?? surely x could be anything?

but the bike wasnt even good (Honda XR 250), altho i did get hit by a truck (he ran an intersection as he didnt see me) which is kinda cool

you cant take the log of a negative number, so 1-2x has to be greater than 0, i made a flamingo up though, the rest is right i think. Man hit by a truck!? ok....

I love you guys so much at the moment (but in a heterosexual male kinda way) esp. Spaam, Catholic Commies and Silica.
If any of you guys come to NZ gimmie a yell, I owe you heaps of beers or whatever you drink.

you cant take the log of a negative number, it has to be greater than 0, i made a flamingo up though, the rest is right i think. Man hit by a truck!? ok....

A flamingo??
is that some kind of maths jargon??

It was only a small truck, takes like a 1 ton payload or something, but it still hurt like hell

I love you guys so much at the moment (but in a heterosexual male kinda way) esp. Spaam, Catholic Commies and Silica.
If any of you guys come to NZ gimmie a yell, I owe you heaps of beers or whatever you drink.
Ahhh now I might just take you up on that!

Whereabouts are ya?

A flamingo??
is that some kind of maths jargon??

heheh no.. flamingo up is like a cock up only bigger - can't remember what its from, black adder? monty p? faulty towers? dunno. ENGLISH COMEDY ROCKS!!!

mmm free beer.....

Ahhh now I might just take you up on that!

Whereabouts are ya?

Christchurch, New Zealand.
Will be visiting Australia later this year (hopefully)
And then Visiting Europe sometime in the next 5 years (after i finish my course and get some work experience so hopefully i can get a job there)

heheh no.. flamingo up is like a cock up only bigger - can't remember what its from, black adder? monty p? faulty towers? dunno. ENGLISH COMEDY ROCKS!!!

mmm free beer.....

Its not black adder (Rowan Atkinsons best by far), I know all of its series off by heart, sounds more like monty p but not sure, I know faulty pretty well but never heard it.
I agree with both british comedy rocking (esp the random bands playing on the young ones) and with the mmm free beer :D

Christchurch, New Zealand.
Will be visiting Australia later this year (hopefully)
And then Visiting Europe sometime in the next 5 years (after i finish my course and get some work experience so hopefully i can get a job there)

What? you live in NZ and wanna get a job in europe?! your crazy.. I wanna live in NZ!! englands cack, and everyone else in europe hates the brits :( , so its either oz or nz.

Hey spaam, your a maths student? while we're just about on the subject, think you could help me too? pleeeeeeeeeeze

What? you live in NZ and wanna get a job in europe?! your crazy.. I wanna live in NZ!! englands cack, and everyone else in europe hates the brits :( , so its either oz or nz.

Hey spaam, your a maths student? while we're just about on the subject, think you could help me too? pleeeeeeeeeeze

I just want to travel the world and its a lot cheaper to use europe as a launch than NZ. And working means i dont have to save for as long before hand :D

Whats wrong with england?? I'd reccomend NZ unless you like red dirt. If you do then go to aussie :p

englands ok i guess, bit boring and full of chavs now :( i dunno, it feels kinda old, dunno how to describe it. its everyones dream here to go to oz. but my ex fiancee's (haha long story not as good as it sounds) granparents came from nz and ive always wanted to go there. some mates of mine went recently on a sort of world tour, and to cali, oz and thailand.. wish i could afford that...

englands ok i guess, bit boring and full of chavs now :( i dunno, it feels kinda old, dunno how to describe it. its everyones dream here to go to oz. but my ex fiancee's (haha long story not as good as it sounds) granparents came from nz and ive always wanted to go there. some mates of mine went recently on a sort of world tour, and to cali, oz and thailand.. wish i could afford that...

remember its cheap here, as a student i live on about $280 (about 108 GBP or 158 EUR) during term and altho its bugger all it pays rent, petrol, food and beer.
So you dont need to save up much to survive here. Also our unemployment (esp. in christchurch) is practically nothing. I had an aussie friend come here (with no qualifications) ans she got 3 job out of the 4 she applied for in the first day. I applied for 2 and got both. So its piss easy to get a job

btw, any ideas been made on the graph for 2a?
I dont understand it at all

well i think i got it, but everyone else seems to have gone, would be good for someone to check...

you got y = ln(1-2x) and you cant have a log of a negative number, so:

1-2x > 0
1 > 2x
1/2 > x

so the vertical asymptote is at x = 1/2

as ln(1) = 0, thats the y intercept

so y = 0 when 1-2x = 1

1 - 2x = 1
-2x = 0
x = 0

i can draw a sketch but dont know how to get it to you, can you post attatchements in this forum?

well i think i got it, but everyone else seems to have gone, would be good for someone to check...

you got y = ln(1-2x) and you cant have a log of a negative number, so:

1-2x > 0
1 > 2x
1/2 > x

so the vertical asymptote is at x = 1/2

as ln(1) = 0, thats the y intercept

so y = 0 when 1-2x = 1

1 - 2x = 1
-2x = 0
x = 0

i can draw a sketch but dont know how to get it to you, can you post attatchements in this forum?

dont think so, you can only post url's or pictures that are online. I think i can work it out from that though. thanks. if you come here give me an email or something. I will hook you up with a room to stay in while you get your feet settled at the very least :D show you some kiwi hospitality so you have a favourable opinion of here for a little bit atleast.
email is burnt_house@hotmail.com (if you have msn feel free to add me to that if you want)

cool, cheers, (dont forget the beer!) would say the same about england but i can't really! havent got a house, and its well hard to find decent places to rent at a reasonable price. you might not want to post your email address on a public forum, arent there like people going around looking for them so they can spam you?

its everyones dream here to go to oz.
!?!?

dont forget the beer!
I wont :D
you might not want to post your email address on a public forum, arent there like people going around looking for them so they can spam you?
Thats why its my hotmail address, i didnt pay for that one so although it would be a pain in the A*** its no biggy

!?!?

lol :rolleyes: was talking about all my friends where i live, in that we're fed up with england in general, hence the world tour. ;)