Richiez: @Johnpaul, Edis4christ and Mbachiboy welcome back on board

tnx general Richiez, we are all loyal to our boss sir

pawn89: nice thread however, i have a question

Given that y1(x) = x^-1 is one solution of 2x^2yII + 3xy^-1 -y =0 for x>0; find the second solution

Pls rephrase ur qust 4 clearer understanding........nt clear wit d 2yII

Mbahchiboy: Plz guys i really need ur help although its nt a maths question..they'v been an arguement about d first person who discovered an "electron"..is it jj thompson,michael faraday or william crookes? nd plz give reasons

Joseph .j. Thompson was d 1st person who discovered electrons. Though gasses cnt conduct electricity, but he said wen d pressure is lowered, nd d p.d is increased, it does. He found dat cathode rays ae deflected by magnetic field, so dey ae composed of negatively charged particles.

Besto:
yeah...ndu takes 2nd choice....yeah but if ur pume performance aint fair...u myt be given a science course....instead of the engnr.

Tnx.....am indeed gr8ful

pls does NDU take second choice, and is there any possibility of being admitted into petroleum engineering with a jamb score of 189?

Mbahchiboy: Let me give it a trial..LET 3xyz=R.H.S nd x^3+y^3+z^3=L.H.S if x+y+z=0,dat is x+y=-z -:frm 2 x^3+y^3+z^3=0 :x^3+y^3=(x+y)(x^2-xy+y^2) nd x^2+y^2=(x+y)^2-2xy, :x^3+y^3=(x+y){(x+y)^2-2xy-xy)} :x^3+y^3=(x+y){(x+y)^2-3xy} Recall x+y=-z :x^3+y^3+z^3=-z{(-z)^2-3xy}+z^3,-z(z^2-3xy)+z^3=-z^3+3xyz+z^3=3xyz :X^3+Y^3+Z^3=3xyz -:L.H.S=R.H.S..plz dnt mind my solving am on mobile

Masta mbah, ur boy hail o

Besto:
yea its the same thing
Double honours.

Tnx boss

greetings 2 all my boss in d haux
Pls i nid u guys 2 do dis 4 me
If x+y+z=0, prove dat x^3+y^3+z^3=3xyz

pls i want to study petroleum engineering at NDU, but wen i wanted to fill it in my jamb change of skul form i didnt c it, instead is saw chemical/petrochemical engineering.....is it dsame am petroleum, or wen i get there i will switch?.....pls hlp me

maximad:


SOLVE

7-4*5+(25+9*2-1)/3 = ?


LIKE US ON FACEBOOK AND GET MORE SCHOOL INFOS WIN RECHARGE CARDS N GET HELP JUST CLICK ON NIGERIAN UNIVERSITIES STUDENT LINK IN THE SIGNATURE

The ans is 29/3

Adex097: 1) The Sine, cosine and tangent of 240' are, respectively
A. √3/2, -1/2 and √3
B. -√3/2 , -1/2 and √3
C. -√3/2 , 1/2 and -√3
D. √3/2 , 1/2 and √3


2)Which of the following have the same values as sin 15' ?
(I) Sin 165' (ii) Sin 285'
(Iii)Sin (-15') (iv)Sin(-195')

A. I and ii only
B. Iii and iv only
C. I and iii only
D. I and iv only

3). Two of the angles of a triangle are 120' ans 45' . If the side facing the angle 45' is 10cm long , then the side facing the angle 120' is

A. 5√3 cm
B. 5√6 cm
C. 10√2 cm
D. 20 cm

1) B
2) D
3) B

t.boy007:
ok grab this:
chemistry:
which of the following is the increasing sensitivity to light?
a)AgI >AgCL>AgBr
b)AgBr >AgCL>AgI
c)AgCl >AgBr>AgI
d)AgBr >Agi>Agcl
2)the compressibility factor for a real gas is?
a)equal to 1
b)zero
c)not equal to 1
d)constant
3)at what ph scale will magnesium metal librate gas
a)>1
b)<1
c)>7
d)<7
4)what is the hybridyzation for diamond
a)sp3
b)sp3d2
c)sp2
d)sp3d
5)how many isomer has an heptane
a)5
b)8
c)7
d)6
6)which of the following is an antiknock
a)ethyne
b)2-methyl pentane
c)1,2-dichloroethane
d)none of the above

physics:
1)the major difference between x-ray spectrum and optical spectrum is?
a)they differ with intensity
b)they differ with colours
c)they differ with different metal
d)they differ with number of electron
2)in the conversion of galvanometer to ammeter,
a)a wire of low resistance in parallel
b)high resistance in series
c)multiplier in parallel
d)multiplier in series
3)the conductivity of a semiconductor increases with
a)decrease temperature
b)increased temp
c)increased pressure
d)constant
GOOD LUCK

1) C
2) B
3) D
4) A
5) heptane has 9 isomers
6) D
PHYSICS
1) B
2) A

emmyeuler1: WHERE U ABLE TO CONFIRM THE FORMULA 4 ENERGY DENSITY BY BROWSING?...I WILL BE EXPECTING UR FEED-BACK

ENERGY DENSITY=ENERGY/AREA
ITS UNIT IS J/M^2

larri: 1. Which of this is a materials for d smelting of iron ore in a blast furnace A.CaCO3 B.Zn(NO3)2 C.CuSO4 D.AlCl3 E. CaSo4
2.Which of this silver halide salt is readily soluble in ammonium hydroxide A.AgI B. AgBr C.AgCl D. AgF.
3. Chlorine,bromide and iodine resemble each other in that all A.dissovle in alkalis B. React violently with hydrogen without heating C.displace each other from solutions of their salts D.are gases E.are liquids.

1) A
2) C
3) C

emmyeuler1: what is the general formula for grignards reagent?

R-Mg-X
Where R is for d Akyl group, Mg for magnesium nd X for d Halogens

Adex097: 1)If y=√x^2 + 1 , then dy/dx at X=-1 is
A. √2/2
B.-√2/2
C. √2
D.-√2

2)Differentiate 3/(1-2x)^2 with respect to x.
A. 12/(1-2x)^3
B. -12/(1-2x)^3
C. 12(1-2x)^-4
D. 6/(1-2x)^3

3)Integrate (x - 1/x)^2 with respect to x.
A. 1/3(x-1/x)^3 + c
B. X^3/3 - x - 1/x^3 + c
C. X^3/3 - 2x + 1/x^3 + c
D. X^3 - 2x -1/x + c

Good luck

1) B
2) A
3) A

Adex097: Solve the following partial fractions

1)Resolve the value of M if

Z-3/(1-z)(z+2)=M/1-z + N/z+2

A. -5/3
B. 5/3
C. -2/3
D. 2/3

2)Resolve 3/y^2+y-2 into partial fractions

A. 1/y-1 - 1/y+2
B. 1/y+2 + 1/y-1
C. 1/y+1 - 1/y-2
D. 1/y-2 + 1/y+1

3)Express 5y-12/(y-2)(y-3)
In partial fractions

A. 2/y-2 - 3/y-3
B. 2/y-2 + 3/y-3
C. 2/y-3 - 3/y-2
D. 5/y-3 + 4/y-2


GOOD LUCK

1) C
2) A
3) B

Adex097: 1)a group of photograph of a family of six(for children and their parents) is to be taken . If the parentst must occupy the two middle seats, then the number of different arrangements is.
A. 48
B. 120
C. 24
D. 720

2. A square pyramid and a cuboid have thesame height and the areas of their bases are equal. The ratio of their volume is.
A.1/6
b.1/4
c.1/3
d.1/2

3.sec θ sin(90' - θ) equals.
A.1
b.0
c.tan θ
d.cot θ

1) D
2) C
3) A

Ortarico:

No bro, the fraction of meat can't be 5x/24.
Now this is according to the way of your working:
Budget=x
provision=x-x/4=3x/4. . .the fraction left
Now half of the fraction that is left is for staples: 1/2*3x/4=3x/8. . .fraction of staples
therefore the fraction left after deducting the fraction of staples is 3x/4-3x/8= 3x/8.
Now the fraction allocated for meat is 1/3 of the remaining fraction: 1/3*3x/8= 3x/24.
Therefore the amount-total fraction is: x - (x/4+3x/8+3x/24)
= x - (6x+9x+3x/24)
= x - 18x/24
=24x-18x/24
= 6x/24
6x/24=350
6x=8400
x=1400. . . .Actually!

No bro........i dnt tink so

Adex097: 1)Calculate 2034+4213-3112
A. 3240
B. 3130
C. 3140
D. 14414
NB: all in base 5

2)A housewife spent a quarter of her food budget on provisions,half the balance on staples and one-third of the remainder on meat. If she was left with #350, how much was her food budget?
A. #700
B. #1,050
C. #1,400
D. #2,100

3)Solve for x: 9^x=27 X 3^1-x
A)4/3
B)3/2
C)-1
D)2/3

1) d ans is B
2) let her budget 4 food be x.
x/4=money on provision.
(x-x/4)1/2=3x/8=money on staples.
D remainder=x-3x/8=5x/8. Therefore one-third of d remainder=1/3X5x/8=5x/24
x-(x/4+3x/8+5x/24)=350. Den look 4 d l.c.m nd solve. U will ave x=2100
3) d ans is A

Johntosyne: Which of d ff can b use to replace steel in a machine, nd also eliminaté friction in d machine? A. Iron B. Aluminium C. Carbon D. Nylon

I tink d ans is C. Carbon. because graphite one of d allotrope of carbon is soft nd flaky, it cn b used 2 reduce or eliminate friction in a machine

[color=#990000][/color
X=1
Y=1/5
Z=6/5