Twitter Page || FaceBook Page || Join BBM || InstaGram page || FaceBook Group

Edu : Waec 2018 Mathematics Objectives & Theory Expo Answers

Views: 4652 Posts: 0 Started By: oladamats Last Poster: Joseph Last Post Date: Apr 18, 2018
Apr 17 ( Post 1 )



We Already Have The Question, All You Need To View It Bring More Of Y our Friends And We Would Post it


MATHEMATICS SOLUTIONS

Mathematics Obj

1: ACBCDCBAA
10: CDCABCCCAC
20: DADBABCCBD
30: BADADBCACB
40: ADDDBDACA

Stay Bless, See You Next Time


=========================
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
==================
9) Using cosine rule,

|TQ|ˆ² = 4ˆ² + 6 ˆ² – 2(4)(6) cos30°

|TQ|ˆ² = 16 + 36 – 48(0.8660)

|TQ|ˆ² = 52 – 41.568

|TQ|ˆ² = 10.432

TQ = √10.432

TQ = 3.23CM

From similar triangles;

|PT|/|TQ| = |PS|/|SR|

4/3.23 = 10/|SR|

4|SR| = 32.3

|SR| = 32.3/4

|SR| = 8CM (nearest whole number)
================
7a)
(y-y1)/(x-x1)=(y2-y1)/(x2-x1)
(y-5)/(x-2)=(-7-5)/(-4-2)
(y-5)/(x-2)=-12/-6
(y-5)/(x-2)=2
Cross multiply
y-5=2(x-2)
y-5=2x-4
2x-y-4+5=0
2x-y+1=0

(7bi)
DRAW THE DIAGRAM

(7bii)
(I)
p^2=q+r^2-2qrcosP
p^2=8^2+5^2-2*8*5*cos90
p^2=64+25-0
p^2=89
p=sqroot(89)
p=9.4339km
therefore |QR|=9.43km(3 sf)

(II)
q/sinQ=p/sinP
8/sinQ=9.4339/sin90
sinQ=(8*sin90/9.4339
sinq=(8*1)/9.4339 =0.8480
Q=sin^1(0.8480)=57.99 degrees
but Q=30+ A
A=Q-30
=57.99-30
A=27.99 degrees
The bearing of R from Q
=180-A
180-27.99
=155.01
=>152 degrees
=================



Go Below For More

























Like Us On Social Media


Loading......99%

If I dont See You Coming In Here For More, I Would Only Post More If We Hit 650 Views,So Start Sharing Or Likes Us Or Follow Us Above , Let Me See How Serious You Are Here
+++++++++++++++++++++++++++++
As you know Loadedbaze never disappoint when it comes to serving 100% correct expo. We are at it again for Waec 2018

You Want Fast Answers, Invites More Of Your Friends
Reaction Buttons

<

Make A Reply Below!

Desired Name:

Comment:

Confirm You Are Human


|



Tvmack