WAEC GCE 2018 MATHEMATICS BY ENGR NASER

By ENGR NASER DAHER -
(2)
Let musa's age=x.
Manya's age=y.

x-y=3---------(1)
Also x=3+y------(2)
7years ago
Musa's age=x-7
Manya's age=y-7
x-7=2(y-7)
x-7=2y-14
x-2y=-14+7
x-2y=-7-------eqn(3)
Put eqn(2) into eqn(3)
3+y-2y=-7
-y=-7-3
-y=-10
Y=10
But x=3+10=====>x=13
Also therefore Musa's age is x =13,
And Manya's age is y=10


More coming✍🏼✍🏼✍🏼✍🏼
®
(1b)
Sin 48 =x / 250
X =250 sin 48 degrees
X = 250 * 0 . 7431
X =185 . 7775 m
=186 m

Rf-team
(2)
Let musa's age=x.
Manya's age=y.

x-y=3---------(1)
Also x=3+y------(2)
7years ago
Musa's age=x-7
Manya's age=y-7
x-7=2(y-7)
x-7=2y-14
x-2y=-14+7
x-2y=-7-------eqn(3)
Put eqn(2) into eqn(3)
3+y-2y=-7
-y=-7-3
-y=-10
Y=10
But x=3+10=====>x=13
Also therefore Musa's age is x =13,
And Manya's age is y=10

More coming✍🏼✍🏼✍🏼✍🏼
Rf-team
(3)
CIRCUMFERENCE OF TWO SEMI CIRCLES* =PIEd
22 / 7 X 120
= * 377 . 142 *
2 ( 377 . 142 + 60)
=874 . 29 Km

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