 Waec 2018 Mathematics Answers, Questions And Answers Expo Posted Here, WASSCE 2018 Mathematics Obj And Theory Answers May/June Expo, Waec 2018 Maths Answers

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Maths Obj
1-10: ACBCDDCBAA
11-20: CDCABCCCAC

1)
On February 28th 2012
Value = (100-30/100) * #900,00.00
= 70/100 * #900,00
= #630,000.00

On february 28th 2013
Value = (100-22/1000 * #630,00
= 78/100 8 #630,000
= #491,400

On february 28th 2014
Value = 78/100 8 #491,400
=383,292

On february 28th 2015
Value = 78/100 * #383,292
= #298,967.76

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NO2)
Given that y = 2pxˆ² – p² x – 14
AT (3, 10)
10 = 2p(3)² – p² (3) – 14
10 = 18p – 3p² – 14
3p² – 18p + 24 = 0
p² – 6p + 8 = 0

Using factor method,

p² – 2p -4p + 8 = 0
p(p-2) – 4(p-2) = 0
(p-4)(p-2) = 0
p-4 = 0 or p-4 = 0
p= 4 or p =2

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2b) The lines must be solved simultenously

3y – 2x = 21 ——- (1)

4y + 5x = 5 ——-(2)

using elimination method,

(4) 3y – 2x = 21

(30 4y + 5x = 5

12y – 8y = 84 ——— (3)

12y + 15x = 15 ——-(4)

equ (4) minus equ(3)

23x = -69

x = -69/23

x = -3

Put this into equation (1)

3y -2(-3) = 21

3y = 6 = 21

3y = 21 -6

3y = 15

y =15/3

y = 5

coordinates of Q is (-3, 5)

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(3a)
The diagonal = 10.2m and 9.3cm
Using Pythagoras theory
Ac² = 10.2² + 9-3²
Ac² = 104.04 + 86.49
Ac² = 190.53
Ac² = √190.53
Ac² = 13.80

(3b)
DRAW THE DIAGRAM
Using Pythagoras theory
5² = 3² + x²
x² = 5² – 3²
X²= 25 – 9
X² = √16
X= 4cm
= 4/5
Tan X = opp/adj. = 3/4
5cos x – 4tan x
5(4/5)- 4(3/4)
20/5 – 12/4
4-3= 1

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4 ai)
sum of angle in a D = 180 degree
xdegree + 90degree + 180 degree – ( 3 x+ 15)=180 degree
xdegree + 90degree + 180 degree – 3 x+ 15= 180 degree
– 2 x= 180 degree – 255
+ 2 x/ 2 = + 75/ 2
x= 37. 5
4 aii )
152 degrees
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(8a)
Cost price for Lami= #300.00
Profit made by lami = x%
Ie selling price for lami=(100+x/100)×#300
=#3(100+x)
=#(300+3x)

Bola’s cost price = #3(100+x)
Selling price for bola =(100+x/100)×#3(100+x)
=#3/100(100+x)²

James cost price =#3/100(100+x)²=300+(6x+3/4)
expanding;
3/100(10000+200+x²) = 300+3/4+6x
3(10000+200x+x²)=30000+75+600x
30000+600x+3x²=30000+75+600x
3x²=75
X² = 75/3
X² = 25
X = square root 25
X = 5

(8b)
3x-2<10+x<2+5x 3x-2<10+x & 10+x<2+5x 3x-x<10+2 & 10-2<5x-x 2x<12 8<4x X<12/2 4x>8
X<6 x>8/4
X>2

Also; 3x-2<2+5x -4<2x 2x > -4
X > -2
Therefore; Range is -2