Waec Mathematics 1992 Past Questions and Answers

Question 6:

• WAEC 1992

A bricklayer measured the length of a wall and obtained 4.10m. If the actual length of the wall is 4.25m, find his percentage error.

A. 3 9/17%
B. 3 27/41%
C. 15%
D. 35 5/17%
E. 36 24/41%

Question 7:

• WAEC 1992

The nth term of a sequence is given by 3.2\(^{n-2}\). Write down the first three terms of the sequence.

A. 2/3, 0, 6
B. 3/2, 3, 6,
C. 2/3, 3, 8/3
D. 2/3, ³/₄, 6
E. 2/3, 3, 1/3

Question 8:

• WAEC 1992

Simplify: \((\frac{16}{81})^{\frac{1}{4}}\)

A. 8/27
B. 1/3
C. 4/9
D. 2/3
E. -4/3

Question 9:

• WAEC 1992

Evaluate \(\log_{10} 25 + \log_{10} 32 - \log_{10} 8\)

A. 0.2
B. 2
C. 100
D. 409
E. 490

Question 10:

• WAEC 1992

Factorize the expression 2y\(^2\) + xy - 3x\(^2\)

A. 2y (y + x) - 3x²
B. (2y - x)(2y + x)
C. (3x - 2y(x - y)
D. (2y + 3) x (y - x)
E. (x – y)(2y + 3x)