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NECO Mathematics Past Questions & Answers - Page 28

136.

A petrol attendant recorded the number of vehicles that bought petrol from him for -3 hours and recorded 12 cars and 27 buses. What is the probability that the next vehicle will be a bus?

A.

$\frac{4}{39}$

B.

$\frac{4}{13}$

C.

$\frac{5}{13}$

D.

$\frac{6}{13}$

E.

$\frac{9}{13}$

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

137.

If sin 30° = 0.5, what is the cosine of its complement?

A.

-0.866

B.

-0.5

C.

0.0.5

D.

0.866

E.

1

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

138.

What is the total surface area of a cuboid whose dimensions are 12cm × 8cm × 3cm?

A.

312cm $^2$

B.

96cm $^2$

C.

36cm $^2$

D.

24cm $^2$

E.

12cm $^2$

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

139.

If , sT = $\sqrt{\frac{[(a + T)T]}{a}}$ what does T equal?

A.

T = (a²s² – 1)

B.

T = (a²s²– 1) ÷ a

C.

T = a ÷ (a² - s²)

D.

T = a ÷ (a²s² – 1)

E.

T = (as – 1)²

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

140.

A cone was developed from a sector of a circle with radius10cm and an angle at the centre of 108°. What is the radius of the cone?

A.

9.0cm

B.

8.5cm

C.

7.2cm

D.

4.3cm

E.

3.0cm

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

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