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WAEC Mathematics Past Questions & Answers - Page 50

246.

Consider the statements: p it is hot, q: it is raining

Which of the following symbols correctly represents the statement "It is raining if and only if it it is cold"?

A.

p q

B.

p q

C.

p q

D.

q p

Correct answer is D

No explanation has been provided for this answer.

247.

Make x the subject of the relation d = 6xy2

A.

x = 6+12d2+y

B.

x = 12d2y

C.

x = 12y2d2

D.

x = 122d2+y

Correct answer is D

d = 6xy2

d2=6xy2

2xd2=12xy

2xd2+xy=12

x = 122d2+y

248.

The roots of a quadratic equation are 12 and 23. Find the equation.

A.

6x2x+2=0

B.

6x2x2=0

C.

6x2+x2=0

D.

6x2+x+2=0

Correct answer is B

(x + 12) (n - 23)

x223x+x213

6x24n+3n2=0

6x2x2=0

249.

Find the 6th term of the sequence 23715415,...

A.

-13

B.

-15

C.

-115

D.

19

Correct answer is A

a = 23, d = 71523

= 7 - 10

= 315

d = - 15

T6 = a + 5d

= 23 + 5(15

= 23 - 1

= 233

= 13

250.

Simplify the expression a2b4b2a4ab(a+b)

A.

a2b2

B.

b2a2

C.

a2bab2

D.

ab2a2b

Correct answer is D

a2b4b2a4ab(a+b) = a2b24(b2a2ab(a+b)

= ab[(ba)(b+a)]a+b

= ab(b - a)

= ab2a2b