Waec Mathematics Past Questions and Answers

Question 596:

• WAEC 1998

The side of a square is increased from 20cm to 21cm. Calculate the percentage increase in its area

A. 2.5%
B. 9.3%
C. 10.0%
D. 10.25%

Question 597:

• WAEC 1998

Arrange in ascending order of magnitude \(26_8, 36_7, and 25_9\)

A. \(25_9 26_8 36_7\)
B. \(26_8 25_9 36_7\)
C. \(36_7 26_8 25_9\)
D. \(36_7 25_9 26_8\)

Question 598:

• WAEC 1998

A, B and C are subsets of the universal set U such that : \(U = {0, 1, 2, 3,..., 12}; A = {x : 0 \leq x \leq 7}; B = {4, 6, 8, 10, 12}; C = {1 < y < 8}\), where y is a prime number.
(a) Draw a venn diagram to illustrate the information given above;
(b) Find: (i) \((B \cup C)'\); (ii) \(A' \cap B \cap C\).

Question 599:

• WAEC 1998

(a) Given that \(\log_{10} 2 = 0.3010, \log_{10} 7 = 0.8451\) and \(\log_{10} 5 = 0.6990\), evaluate without using logarithm tables:
(i) \(\log_{10} 35\); (ii) \(\log_{10} 2.8\).
(b) Given that \(N^{0.8942} = 2.8\), use your result in (a)(ii) to find the value of N.

Question 600:

• WAEC 1998

(a) The value of the expression \(2Ax - Kx^{2}\) is 7 when x = 1 and 4 when x = 2. Find the values of the constants A and K.
(b) Solve the equation \(x^{2} - 3x - 1 = 0\), giving your answers correct to 1 decimal place.