**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

21-30: DADBABCDAD

31-40: BADADBCACB

41-50: ADDDBDADCA

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

========

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

===========

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)

============

(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

CosX = adjacent/hyp

= 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

============

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 )

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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)

Profit made by bola =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