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 : $U=0,1,2,3,...,12;A=x:0\le x\le 7;B=4,6,8,10,12;C=1<y<8$, where y is a prime number.
(a) Draw a venn diagram to illustrate the information given above;
(b) Find: (i) $(B\cup C{)}^{\prime }$; (ii) $A^{\prime }\cap B\cap C$.

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 $2Ax-K{x}^2$ 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.