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NECO Mathematics Past Questions & Answers - Page 12

56.

What is the Value of 11101 $_{two}$ + 10011 $_{two}$ - 10001 $_{two}$ ?

A.

10001 $_{two}$

B.

10011 $_{two}$

C.

10111 $_{two}$

D.

11111 $_{two}$

E.

111111 $_{two}$

View answer & explanation

Correct answer is D

11101 $_{two}$ → 29

+ 10011 $_{two}$ → 19

- 10001 $_{two}$ → 17

11111 = 31

57.

Evaluate 0.0025 × 2.5 × 102 to 2 significant figures.

A.

0.625 × 10^-3

B.

0.63 × 10^-2

C.

6.25 × 10^-3

D.

6.3 × 10^-2

E.

6.3 × 10^-1

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

58.

If x + $\frac{1}{x}$ = 8, find x² + $\frac{1}{x^2}$

A.

64

B.

62

C.

32

D.

16

E.

4

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

59.

A surveyor measured the length of a obtained 42.55 metres. If his measurement was more than the actual length and the percentage error of his measurement was 8%, calculate the actual length of the land

A.

39.40 metres

B.

46.20 metres

C.

46.25 metres

D.

46.50 metres

E.

48.25 metres

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

60.

Solve for x in the quadratic equation. 2x² + 12x + 10 = 0

A.

x = -5, -1

B.

x = -5,1

C.

x = -3, -2

D.

x = 3, 2

E.

x = 6, 5

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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