Neco 2016 Mathematics Obj & Theory Answers | Neco Expo | Exam Runz

Unlimitedapps (1a)
Tabulate: Draw both vertical and horizontal lines across the digits. I drew only verticals cos it's text messaging.
x|1|2|3|4
1|1|2|3|4
2|2|4|0|2
3|3|0|3|0
4|4|2|0|4
1b)
I = PRT/100, p=N15000 R=10% and I=3years
A = P+ I
where I = 15000*10*3/100=N4500
A=4500+15000 =N19500
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2a)
using sine rule
b/sin20 = 6/sin30
bsin30 = 6sin120
b 6sin120/sin30
b = 6x0.2511/0.4540
b = 5.7063/0.4540
b = 12.57 ≠ 12.6cm
2bi)
the diagram is euivalent triangles.
where
|AX|/|BC| = |BY|/|AC| = |XY|/|YC|
XY = 9, BY = 7
YC = 18-7=11
9/11 = 7/|AC|
9|AC| = 77
|AC| = 77/9
|AC| = 8cm
2bii)
XY/AB = BY/AC
9/|AB| = 7/8.6
|AB| = 9x8.6/7
|AB| = 11cm
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3)
let the son age be x
man=5x
son=x
4yrs ago;the man age = 5x - 4
the son age = x - 4
the product of their ages
(5x - 4)(x - 4) =448
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4a)
volume of fuel = cross-sectional area of X depth of fuel rectangular tank
30,000litres = 7.5*4.2*d m^3
but; 1000litres =1m^3
therefore;30(M^3) = 7.5*4.2*d(M^3)
30=31.5d
====> d = 30/31.5 = 0.95(2d.p)
4b)
to fill the tank/volume of fuel needed
= 7.5*4.2*1.2
= 37.8m^3
= 37,800 litres
addition fuel = 37,800-30,000
= 7,800 litres
therefore, 7,800 more litres would be needed
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5a)
sector for building project =48000/144000*360=120degree
sector for education = 32,000/144000*360=80degree
sector for saving = 19200/144000*360=48degree
sector for maintenance = 12000/144000*360=30degree
sector for miscellaneous = 7200/144000*360=18degree
sector for food items = 360-(120+80+48+30+18)
=360-296
=64degree
5b)
amount spent=144000-[48,000+32000+19200+12000+7200]
=144000-118400
=N25600
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No6)
tabulate
No
41. 02sqr 0. 7124
42. 81
0. 207
0. 0404
antilog ( 0. 6616 )
=4. 587
log
1. 6130 ===> 1. 6130
T . 8527 /2
=2^- + 1. 8527 /2 +
T + 0. 9264 ===> T . 9264 1 . 5394
1. 6321
T . 3160 +
2^-. 6064
T . 5545 ===> T . 5545
1. 9849 ===> 1. 9849 /3
= 0 . 6616
++++ +++++ +++++ +++++ +++++ +++++
7a)
3^2n+1 - 4(3^n+1)+9=0
3^2-3 - 4(3^n -3)+9=0
(3^n)^2-3 - 4(3^n -3)+9=0
let 3^n = p
p^2 -3 - 4(p-3)+9=0
3p^2/3 - 12p/3 + 9/3 = 0
p^2 - 4p + 3 = 0
p^2 - 3p - p + 3 = 0
p^2p(p-3) - 1(p-3) = 0
(p-1)(p-3) = 0
p-1 = 0 or p-3 = 0
p = 1 or 3
Recall 3^n = p
when p=1
3^n = 3^0
n = 0
when p = 3
3^n = 3^1
n = 1
7b)
log(x^2+4) = 2+logx - log^20
log(x^2+4) = log^100 = log^x - log^20
(x^2+4) = log(xx)
x^2+4 = 5x
x^2-5x+4 = 0
x^2-4x - x +4 = 0
x(x-4) - 1(x-4) = 0
(x-1)(x-4) = 0
x-1 = 0 or x-4 = 0
x = 1 or 4
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8a)
|AD|^2=13^2-5^2
|AD|^2=169-25
|AD|^2=144
AD=sqr144
AD=12CM
|AD|=12-r
r^2=(12-r)^2 - 5^2
r^2=(12-r)(12-r)+25
r^2=144-24r+25
r^2=169-24r
r^2+24r-169=0
r^2+24r=169
r^2+24r+14^2=169+14^2
(r+14)^2=169+196
(r+14)^2=365
(r+14=sqr365
r+14=19.105
r=19.105-14
r=5.105
r=5.1cm
8aii)
circumfrenece of a circle=2pie R
C=2x22/2*(5.1)^2
C=1144.44/7
C=163.4914cm
C=163.5cm
8b)
y2-y1/x2-x1=y-y1/x-x1
6-2/2-(-1)=y-2/x-(-1)
4/2+1 = y-2/x+1
4/3=y-2/x+1
3(y-2)=4(x+1)
3y-6=4x+4
3y-4x=4+6
3y-4x=10
y=4x/3+10/3
9a)
let Xy represent the two digit number
x-y=5 -----(i)
3xy - (10x +y)=14
3xy - 10x - y =14 ----(ii)
from eqn (i)
x=5+y
3y(5+y)-10(5+y)-y=14
15y+3y^2 - 50 - 10y - y =14
3y^2 + 4y -50 = 14
3y^2 + 4y -50 - 14 =0
3y^2 + 4y - 64 =0
3y^2 + 12y + 16y - 64 =0
(3y^2 - 12y) (+16y - 64)=0
by
(y-4)+16(y-4)=0
(y-4)=0
ii)
(3y+16)(y-4)=0
3y+16=0 or y-4=0
3y=-16 or y=4
y=-16/3 or y=4
when y=4
x=5+y
x=5+4
x=9
the no is 94
9b)
3-2x/4 + 2x-3/3
=3(3-2x)+4(2x-3)/12
=9-6x+8x-12/12
=2x-2/12
10a)
y=(2x^2 + 3)^5
let U=2x^2 + 3
Y=u^5
du/dx = 4x
dy/du = 5u^4
dy/du = (2x^2 + 3)^4
dy/dx = du/dx dy/du
dy/dx = 4x.5(2x^2 + 3)^4
dy/dx = 20x(2x^2 + 3)^4
10b)
y=3x^2 + 2x +5
dy/dx =6x + 2
dy/dx =6(3) +2
dy/dx =18+2
dy/dx =20
10c)
R-W=Wv^2/gx
Wv^2=gx(R-W)
Wv^2=gRx-Wgx
Wv^2+Wgx=gRx
W(v^2 + gx) =gRx
W=gRx/V^2 + gx
R=2, g=10, x=3/2, V=3
W= 10*2*3/2/3^2 + 10*3/5
W=30/9+15
W=30/24
W=5/4

11a)
y^1=x^2(3x 1)^2
v=(2x 1)^2
v=m^2
dm/dx=2
dv/dm=2m
dy/dx=dv/dm×dm/dx
=2m×2
=4m
dy/dx=4(2x 1)
dy/dx=udv/dx v whole no
dy/dx
=x^2 4(xx 1)^2,×3x
=4x^2(2x 1) 2x(2x 1)^2.
11b)
[3 3 -1]
[1 0 2]
[3 -2 3]
2[0-(-4)-3[63]
-1(-2)
8 9 2
=19.
11c)
m=y2-y1/x2-x1
y-y1= m(x-x2)
m=4-3/-1-2
m=-1/3
y1-y2=-1/3(x-x2)
y-3=1/3(x-2)
y-3=-4/3 2/3
3y=-x 11
y=-1/3x

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# 2016-06-21 22:32 (Edited by 2016-06-22 02:24 Unlimitedapps ) · (0)