# 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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