Waec Mathematics 1991 Past Questions and Answers

Question 11:

• WAEC 1991

Simplify: ¹/₄(2ⁿ - 2ⁿ⁺²)

A. 2ⁿ² - 2ⁿ
B. 2^n-2(1-2ⁿ)
C. 2ⁿ + 2²ⁿ + 2
D. 2²ⁿ

Question 12:

• WAEC 1991

Find the equation whose roots are -2/3 and -1/4

A. 12x² + 11x + 2 = 0
B. 12x² - 11x + 2 = 0
C. X² - 11/12x + 2 = 0
D. 12x² - 11x - 2 = 0
E. X² - 11/12x - 2 = 0

Question 13:

• WAEC 1991

Solve: 6(x - 4) + 3(x + 7) = 3

A. 3/2
B. 2/3
C. 1/2
D. 1/3
E. O

Question 14:

• WAEC 1991

If 2x + y = 7 and 3x - 2y = 3, by how much is 7x greater than 10?

A. 1
B. 3
C. 7
D. 10
E. 17

Question 15:

• WAEC 1991

A cylinder of base radius 4cm is open at one end . If the ratio of the area of its base to that of its curved surface is 1:4, calculate the height of the cylinder

A. 1cm
B. 2cm
C. 4cm
D. 8cm
E. 16cm