WAEC Mathematics Past Questions & Answers - Page 247

1,231.

p and q are two positive numbers such that p > 2q. Which one of the following statements is not true?

A.

-p < -2q

B.

-p > -2q

C.

-q < 2p

D.

q < 1/2p

E.

p2 > 2q2

Correct answer is B

No explanation has been provided for this answer.

1,232.

Solve the equation 5x2 - 4x - 1 = 0

A.

-1, 1/5

B.

-1, -1/5

C.

1, 1/5

D.

1, -1/5

E.

-1, 5

Correct answer is D

5x2 - 4x - 1 = 0
5x2 5x + x -1 = 0
5x(x - 1) + (x - 1) = 0
(5x + 1)(x -1) = 0
x = -1/5 or 1 = 0

1,233.

Simplify \(\frac{8^{\frac{2}{3}}*27^{\frac{-1}{3}}}{64^{\frac{1}{3}}}\)

A.

-3

B.

\(\frac{1}{9}\)

C.

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

D.

\(\frac{27}{8}\)

E.

4

Correct answer is C

\(\frac{8^{\frac{2}{3}}*27^{\frac{-1}{3}}}{64^{\frac{1}{3}}}\)
\(\frac{2^2*3^{-3}}{4} = 3^{-1} = \frac{1}{3}\)

1,234.

A piece of cloth was measured as 6.10m. If the actual length of the cloth is 6.35, find the percentage error, correct to 2 decimal places

A.

3.05%

B.

3.95%

C.

15.00%

D.

25.00%

E.

39.30%

Correct answer is B

No explanation has been provided for this answer.

1,235.

The nth term of a sequence is represented by 3 x 2(2-n). Write down the first three terms of the sequence

A.

3/2, 3, 6

B.

6, 3, 3/2

C.

3/2, 3, 1/3

D.

2/3, 3, 8/3

E.

3/2, 0, 6

Correct answer is B

When n = 1, n = 2, n = 3
3 x 22 - 1 = 6
3 x 22 - 2 = 3
3 x 22 - 3 = 3/2