Mathematics 2018 Past Questions | WAEC

Study the following Mathematics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

21.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

22.  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
23.  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

24. 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)

25. Find  the \(n^{th}\) term of the sequence 2 x 3, 4 x 6, 8 x 9, 16 x 12…

  • A. 2\(^n\) x 3(n + 1)
  • B. 2\(^n\) x 3n
  • C. 2\(^n\) x 3\(^n\)
  • D. 2\(^n\) x 3\(^n – 1\)

26. If 3x\(^o\) 4(mod 5), find the least value of x

  • A. 1
  • B. 2
  • C. 3
  • D. 4

27.  Find the inter-quartile range of 1, 3, 4, 5, 8, 9, 10, 11, 12, 14, 16

  • A. 6
  • B. 7
  • C. 8
  • D. 9

28.  If  x : y = \(\frac{1}{4} : \frac{3}{8}\) and y : z = \(\frac{1}{3} : \frac{4}{9}\), find x : z

  • A. 2:3
  • B. 3:4
  • C. 3:8
  • D. 1:2

29.  Expression 0.612 in the form \(\frac{x}{y}\), where x and y are integers and y \(\neq\) 0

  • A. \(\frac{153}{250}\)
  • B. \(\frac{68}{111}\)
  • C. \(\frac{61}{100}\)
  • D. \(\frac{21}{33}\)

30. The angle of elevation of the top of a tree from a point 27m away and on the same horizontal ground as the foot of the tree is 30\(^o\). Find the height of the tree.

  • A. 27m
  • B. 13.5 \(\sqrt{3m}\)
  • C. 13.5 \(\sqrt{2m}\)
  • D. 9\(\sqrt{3m}\)
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