NECO Mathematics Past Questions & Answers - Page 26

126.

When a shirt is sold for N12000.00, a loss of 20% is recorded. How much should it be sold for to gain 20%?

A.

N4800.00

B.

N400

C.

N1800.00

D.

N1500.00

E.

N960.00

Correct answer is C

No explanation has been provided for this answer.

128.

If sin θ = \(\frac{\sqrt{3}}{2}\) and 0 < θ < 180°, what is cos θ ?

A.

\(\frac{1}{\sqrt{3}}\)

B.

\(\frac{2}{\sqrt{3}}\)

C.

\(\frac{1}{2}\)

D.

\(\frac{\sqrt{3}}{2}\)

E.

\(\sqrt{3}\)

Correct answer is C

No explanation has been provided for this answer.

129.

>What are the factors of 2x\(^2\) - xy - 3y\(^2\) ?

A.

(2x + 3y)(x + y)2

B.

(2x + 3y)(x + y)

C.

(2x + 3y)(x - y)

D.

(2x - 3y)(x + y)

E.

(2x - 3y)(x - y)

Correct answer is D

2x\(^2\) - xy - 3y\(^2\)

= 2x\(^2\) + 2xy - 3xy - 3y\(^2\)

= 2x(x + y) - 3y(x + y)

= (2x - 3y)(x + y)

130.

A quadratic equation with roots -1\(\frac{1}{2}\) and \(\frac{1}{4}\) is

A.

x2 + 3x + 4 = 0

B.

8x2 + 10x + 3 = 0

C.

8x2 +12x – 3 = 0

D.

8x2 + 10x-3.= 0

E.

8x2 + 12x + 3 = 0

Correct answer is D

No explanation has been provided for this answer.