Waec Mathematics Past Questions and Answers

Question 591:

• WAEC 1998

Evaluate \(\sqrt{20}\times (\sqrt{5})^3\)

A. 10
B. 20
C. 25
D. 50

Question 592:

• WAEC 1998

If P = {3, 7, 11, 13} and Q = {2, 4, 8, 16}, which of the following is correct

A. \((P\cap Q)^l={2, 3, 4, 13}\)
B. \(n(P\cup Q)=4\)
C. \(P\cup Q = \emptyset\)
D. \(P\cap Q = \emptyset\)

Question 593:

• WAEC 1998

It is observed that \(1 + 3 = 2^2, 1 + 3 + 5 = 3^2, 1 + 3 + 5 + 7 = 4^2. \\If \hspace{1mm}1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 = P^2 find\hspace{1mm}P\)

A. 6
B. 7
C. 8
D. 9

Question 594:

• WAEC 1998

Evaluate \(3.0\times 10^1 - 2.8\times 10^{-1}\)leaving the answer in standard form

A. \(2\times 10^{-1}\)
B. \(2\times 10^{2}\)
C. \(2.972 \times 10^{1}\)
D. \(2.972 \times 10^{2}\)

Question 595:

• WAEC 1998

A trader makes a loss of 15% when selling an article. Find the ratio, selling price : cost price

A. 3:20
B. 3:17
C. 17:20
D. 20:23