Waec Mathematics 2008 Past Questions and Answers

Question 21:

• WAEC 2008

If 2ⁿ = 128, find the value of (2^{n - 1})(5^{n - 1})

A. 5(10⁶)
B. 2(10⁶)
C. 5(10⁵)
D. 2(10⁵)

Question 22:

• WAEC 2008

If x \(\alpha\) (45 + \(\frac{1}{2}y\)), which of the following is true>?

A. X varies directly as y
B. X varies inversely as y
C. X is partly constant and partly varies as y
D. X vries jointly as 45 and directly as y

Question 23:

• WAEC 2008

Simplify \(\frac{\log \sqrt{8}}{\log 4 - \log 2}\)

A. \(\frac{2}{3}\)
B. \(\frac{1}{2} \log 2\)
C. \(\frac{3}{2}\)
D. \(\log 2\)

Question 24:

• WAEC 2008

A train travels 60km in M minutes. If its average speed is 400km per hour, find the value of M

A. 15
B. 12
C. 10
D. 9

Question 25:

• WAEC 2008

An arc of a circle, radius 14cm, is 18.33cm long. Calculate to the nearest degree, the angle which the arc subtends at the centre of the circle. [T = \(\frac{22}{7}\)]

A. 11^o
B. 20^o
C. 22^o
D. 75^o