Mathematics 2018 Waec Past Questions and Answers

Question 21 :

• WAEC 2018

The table shows the distribution of goals scored by 25 teams in a football competition. Calculate the probability that a team selected at random scored at most 3 goals.

A. \(\frac{3}{25}\)
B. \(\frac{1}{5}\)
C. \(\frac{6}{25}\)
D. \(\frac{2}{5}\)

Question 22 :

• WAEC 2018

The total surface area of a hemispher is 75\(\pi cm^2\). Find the radius.

A. 5.0 cm
B. 7.0 cm
C. 8.5 cm
D. 12.0 cm

Question 23 :

• WAEC 2018

Find the value of x for which \(\frac{x - 5}{x(x - 1)}\) is defined

A. 0 or 5
B. -5 or 5
C. -11 or 5
D. 0 or 1

Question 24 :

• WAEC 2018

Solved the equation \(2x^2 - x - 6\) = 0

A. X = \(\frac{-3}{2}\) or 2
B. X = -2 or \(\frac{3}{2}\)
C. X = -3 or 2
D. X = 3 or -2

Question 25 :

• WAEC 2018

Factorise completely the expression
\((x + 2)^2\) - \((2x + 1)^2\)

A. (3x + 2)(1 - x)
B. (3x + 2)(2x + 1)
C. 3\((x + 2)^2\)
D. 3(x + 1)(1 - x)