Waec Mathematics 2013 Past Questions and Answers

Question 6:

• WAEC 2013

If Un = n(n² + 1), evaluate U5 - U4

A. 18
B. 56
C. 62
D. 80

Question 7:

• WAEC 2013

If \(\sqrt{50} - K\sqrt{8} = \frac{2}{\sqrt{2}}\), find K

A. -2
B. -1
C. 1
D. 2

Question 8:

• WAEC 2013

A sales boy gave a change of N68 instead of N72. Calculate his percentage error

A. 4%
B. 5\(\frac{5}{9}\)%
C. 5\(\frac{15}{17}\)%
D. 7%

Question 9:

• WAEC 2013

Four oranges sell for Nx and three mangoes sell for Ny. Olu bought 24 oranges and 12 mangoes. How much did he pay in terms of x and y?

A. N94x + 6y)
B. N(6x + 4y)
C. N(24x + 12y)
D. N(12x + 24y)

Question 10:

• WAEC 2013

Simplify: \(\frac{x^2 - y^2}{(x + y)^2} + \frac{(x - y)^2}{(3x + 3y)}\)

A. \(\frac{x - y}{3}\)
B. X + y
C. \(\frac{3}{x - y}\)
D. X - y