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MATHEMATICS (ESSAY/OBJ) Waec 2016 Expo Runz Answers


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Thursday 21st April 2016
MATHEMATICS 2 (ESSAY) 9.30AM - 12.00PM
MATHEMATICS 1 (OBJ) 2.00PM - 3.30PM
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2016 WAEC MATHS OBJ:
1-10) DCBCABBADA
11-20) CCBCABABBA
21-30) AACCDCDABC
31-40) BCDCDCBABA
41-50) ACADBBDADD



4)


6)


7)

================================
8a)
2x = r = y
if =180 - 110 + Y = 70 + Y
nOW : X + r + 70 + y = 180
2x = r + - y
if 2x = r
x = r/2 =y
:x + 2x + 70 + 2x = 180
5x = 180 -70 = 110
x = 110/5 = 22degree


8b)
let A collection of boy be X and that of girl be y
Tot collected by boy
600 + Y = x
Tot collected by girl
x - 600 = y
x- y =600 --(i)
Ave collection for boys
x/10 = 100+y/12(multipled by 120)
x/10 * 120 = 100 * 120 + y/12 *120
12x = 12000 + 10y
12x -10y= 12000 ---(ii)/x - y = 600 *12
12x - 10y =12000 * 1
12x -12y = 7200----(iii)
12x - 10y = 12000
= -2y = -4800
y = 4800/2 = 2400
y = 4800/2 = 2400
subt 2400 for y in eq(i)
600 + y = x
600 + 2400 = x
x = 3000,
boys collection = #3000
girls collection = # 24000
total collected = #54000
================================


9a)
x 62 63 64 65 66 67 68
tally 1 iiiii iiiii iiiii ii iiii iiii iiii iiiii iiiii iiiii i ii
freq 1 5 12 14 10 6 2 total = 50
fx 62 315 768 910 660 402 136 tot = 3253
x-x- -3.06 -2.06 -1.06 0.06 0.94 1.94 2.94
(x-x-) 9.3636 4.2436 1.1236 0.0036 0.8836 3.7636 8.6436 f(x-x)2 9.3636 21.218 13.4832 0.0504 8.836 22.5816 17.2872 tot = 92.82

9bi) mean = EFX/EF = 3253/50 =65.06
9bii) Standard deviation = Square root of EF(x-x)2/Ef
= Square root of 92.82/50
= square root of 1.8564
= 1.36
================================

7a)
x-2/4 :x+2/2x
Cross multiply
2x(x-2)=4(x+2)
Opening the bracket
2x^2-4x = 4x+8
Collect like terms together
2x^2-4x-4x-8=0
2x^2-8x-8=0
Solving with completing the square method
2x^2-8x=8
Divide through with the coefficient of x^2
2x^2/2-8x/2=8/2
X^2-4x=4
Half of coefficient of x
(-4 x 1/2)^2 = (-2)^2
X^2-4x+(-2)^2=4+(-2)^2
X^2-4x+(-2)^2=4+4
(x-2)^2=8
X-2:square root 8
X=2 + or - squar root 8
X=2+ square root 8 or x=2- square root 8
X=2+2.828=4.828
X=2-2.828= -0.828
X=4:83 or - 0.83.
================================

13a)
(x1,y1) =(2,-3)
for 2x + y =6
y=-2x +6
compare y = mx +6
m2 = -2
for parallel lines, m1=m2
: y-y1/x-x1 = m
y--3/x-2 =-2/1
y + 3 = -2(x -2)
y + 3 = -2x + 4
y = -2x + 4 -3
y = -2x +1
================================

9)



11a)
3p+4q/3p-4q* 2/1 find p:q
1(rp+4q)= 2(3p-4q)
3p+4q=6p-8q
Collect like terms
3p-6p=-8q-4q
-3p=-12q
Ther4 p:q = -3p/-3=-12q/-3
P=4q, p=4, q=1
P:q= 4:1

11b)
Ts=pq-(2+2)
Ts=pq-4
Circumference of Ts= 2pie(TS)

11bi)
Ts=pq-(2+2)
Ts=pq-4
Circumference of Ts= 2pie(TS)
=2pie(pq-4)
Perimeter=pq+4+4+2+2+2pie(pq-4)
34=pq+12+2pie(pq-4)
34-12=pq+2piePQ-8pie
22=PQ(1+2pie)-8pie
22=pq(1(2*22/7)-8*22/7
22=pq(1+44/7)-176/7
22=PQ(7+44/7)-176/7
22+176/7 =pq(51/7)
154+176/7=Pq(51/7)
330/7=pq(51/7)
330/51=pq
Pq=6.4706

11bii)
TS=PQ-4=6.4706-4=2.4706m
Area of semi circle TS=pieD
=7.7626m^2
Area of rectangle PqRU=|pu|*|Pq|
4**6.4706=25.8824
Area of the cross section=area of rectangle-area of semi circle
=25.8824-7.7626
=18.1198m^2
================================
6a)
Sn=n/2(2a+(n-1)d)
A=1, d=2, n=n
Sn=n/2(2*1+(n-1)2)
N/2(2+2,-2)
=n/2*2=n^2

6b)
n(E)=95, n(BnT)=7
N(U)=95, n(BnTnC')=7n(B'nTnC)=3,n(BnTnC)=8
n(BnT'nC')=x, n(BnT'nC),n(b)=47, n(T)=30
i)
Draw d venn diagram
ii)
To find x,
X+x+7+8=47
2x=47-15=32
X=32/2
=16
iii)
No of those who travelled by at least two means
7+3+16+8=34















2016 WAEC MATHS OBJ:
1-10) DCBCABBADA
11-20) CCBCABABBA
21-30) AACCDCDABC
31-40) BCDCDCBABA
41-50) ACADBBDADD








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