₦airaland Forum

kidrossy:
pls anyone
5(x-1)+3(2x+9)-2=4(3x-1)+2(4x+3)...@sap

Geofavor:
I too couldn't fault that working. But this textbook has the answers to be different.
I) 12cm
Ii) 30cm
Iii) 336cm^2

Sirneij:
You did a great job at Dejt4u! Thesame explanatory approach is needed here:
1.Find The set of values of x and y which satifies the equation <i>x² - y - 1 =0</i> and <i>y-2x +2 =0</i>.
2.A canal has rectangular cross section of width 10cm and breadth 1m.If water of uniform density 1gm/cm^3 flows through it at a constant speed of 1000mm per minute, find the adjacent sea.
3.If the maximum value of y =1+hx-3x^2 is 13,find h.
4.If a circular paper disc is trimmed in such a way that its circumference is reduced in ratio 2:5,in what ratio is the surface area reduced?

Aminat508:
Love is friendship that has caught fire. It is quiet understanding, mutual confidence, sharing and forgiving. It is loyalty through good and bad times. It settles for less than perfection and makes allowances for human weaknesses

richardjacobs675:
Sir, The car is available for inspection, If you want to see it.

Antoinne:
I suppose the way you were doing it was to resolve dx on one hand, and dy on the other to the lines at y=0 & x=0 respectively, so that you obtained dSx = sqrt(5)dx & dSy = sqrt(5)dy

And you then did, dS = dSx.dSy = 5dxdy. if this is how you did it, then you are wrong.

you should understand that even though, you had rightly resolved the elemental distances, you can't multiply then on that surface, because the surface is also bounded by y = 1-x (at z=0) which means in that plane, x is still dependent on y. If you had the snapshot below (Fig 1) where the elemental distance dy will not be dependent on x anymore on that surface, then it would have made sense.

So, it's easier to use vectors. Cos what you want to do is simultaneously apply the relationships given by the curves while still taking their dependences into consideration. In this way, you'd almost be resolving the surface itself dS and not the elemental distances.

Look at Fig2, where the same surface has been resolved onto the xy plane. On that xy plane, the last coordinate that will make the area the same is (2,2,0). So, if you had an elemental area on that surface dS₁, you can then obtain the angle between that area and the surface with the coordinate (1,1,2). Note that that is a mirror image of the surface in question, but in a different quadrant.

So, the angle between the two surfaces will be
(-1.5i-1.5j).(-0.5i-0.5j+2k) = sqrt(4.5).sqrt(4.5).cos(phi)
cos(phi) = 1/3.

dS.cos(phi) = dS₁
dS = dS₁/cos(phi) = 3dS₁

dS₁ = dxdy

So, dS = 3dxdy.

This elemental area will be the same as the elemental area on the main surface (they are simply mirror images).

Note: you could have resolved to the other side (270-360deg), and you'd have the same answer

Richiez:
Brilliant contribution.
your points have been noted and will come in handy, and for the bolded i need to know what others think about it. does anyone have a contrary view?

dejt4u:
@ d bolded, by His grace, I was the winner of the Season 2 NMQC.. Along with the two very intelligent ladies as the runners up; AmazingAngel and STENON.. So sad that the thread is no more on internet.. Lol

being a quiz master is very tempting but I dont think that I will be very available and I will not want to disappoint you. I am very confident about Agentofchange1 (aka Benbuks), STENON, Alphamaximus, and Naturalwaves (a.k.a Mr Tobi)..

I shall give you all background moral supports I can by His grace..

Thanks for this concept

fineyemi:
Were u blindfolded? Didn't u see physics on the list?

anangboy:
At the risk of posing a self-serving bias, i will say computer science should occupy a high position there. Computer science is entirely applied mathematics. And if you do not know what my last sentence means, sorry l can't save you.

STEM fields are generally nothing to fvck with.

I also remember a Prof of Maths used to say if he wants to fill a vacancy in mathematics, he can only hire a mathematician or a computer scientist.

AweEngineer:
computer science , one of the simplest science course i know.
I think GEOLOGY should be on the list.

**##MyOwnOpinion

dicksonxtreme:
Computer science it's not tough compared to Geophysics and mathematics

I'm a computer science student I know what I'm saying... My roommate is doing geophysic and I see his lecture notes and I feel sorry for him

Lordbammy:
[/b]
Addition and corrections are allowed. No one knows it all. We are all just trying our best *winks*
Source: http://www.nigerianblog.net/forum2_theme_112148371.xhtml?tema=2

Peezzy:
thank you sir. Naturalwaves, seen your reply too..thank you.

Peezzy:
A woman is four times old as her daughter. In four years time she will be three(3) times old as her daughter. What are their ages?

Naturalwaves, dejt4u and others help plzz! Been solving it over and over since yesterday but my answer doesn't seem to be correct

abiodun3934:
pls help me solve this question i need it urgently :let a function f be defined by f(x)=x^2-2x-3/x^2+2x+3 hence determine the domain of f(x) ,find the range of f(x) , find an expression for f(3x+1) and hence determine f(4)

SuperNover:
boss! thanks a million fold. I appreciate. I really do.

SuperNover:
help me out anyone in the house.

if f(y-4)=y²+2y+3, then find f(2)

SuperNover:
help me out anyone in the house.

if f(y-4)=y²+2y+3, then find f(2)

jomoh:
When I rhyme something special happen everytime am the greatest something like Ali in his prime...



"You can have it your way, how do you want it
You gon' back that thing up or should i push up on it......" 50cent Candy shop

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You can call me Skipper
The way I turn the money over
You should call me Flipper" 50cent patiently waiting

Yeah, in Hollywoood they say there's no b'ness like show b'ness
In the hood they say, there's no b'ness like hoe b'ness ya know
They say I talk a lil fast, but if you listen a lil faster
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"And when it seems that am hopeless, you say the word that could kick me back and focus." 2pac Dear mama

tobillionaire:
In triangle XYZ, <YXZ=44, and <XYZ=112, calculate the acute angle between the internal bisectors of <XYZ and <XZY. (A) 12 (B) 56 (C) 68 (D) 78

tobillionaire:
11. Two perpendicular lines PQ and QR intersect at (1, -1), if the equation of PQ is x-2y+4=0, find the equation of QR. (A) x-2+1=0 (B) 2x+y-3=0 (C) x-2y-3=0 (D) 2x+y-1=0.
Find the area bounded by the curve y=3x^2-2x +1, the ordinate x=1 and x=3 and the x-axis. (A) 24 (B) 22 (C) 21 (D) 20

33. Two variables x and y are such that dy/dx=4x-3 and y=5 when x=2. Find y in terms of x (A) 2x^2-3x +5 (B) 2x^2-3x+3 (C) 2x^2-3x (D) 4.
What is the solution set for the equation /2x-3/=13? (A) (5, (B) (-5,

STENON:
thanks, STENON is in the mood of her final exams.
Good morning,
Hope you are good?

eipreel:
Make I follow you run