Waec Mathematics 2015 Past Questions and Answers

Question 31:

• WAEC 2015

In the given diagram, \(\bar{QT}\) and \(\bar{PR}\) are straight lines, < ROS = (3n - 20), < SOT = n, < POL = m and < QOL is a right angle. Find the value of n.

A. 35^o
B. 40^o
C. 55^o
D. 60^o

Question 32:

• WAEC 2015

Make K the subject of the relation T = \(\sqrt{\frac{TK - H}{K - H}}\)

A. K = \(\frac{H(T^2 - 1)}{T^2 - T}\)
B. K = \(\frac{HT}{(T - 1)^2}\)
C. K = \(\frac{H(T^2 + 1)}{T}\)
D. K = \(\frac{H(T - 1)}{T}\)

Question 33:

• WAEC 2015

Which of the following is used to determine the mode of a grouped data?

A. Bar chart
B. Frequency polygon
C. Ogive
D. Histogram

Question 34:

• WAEC 2015

The area of a rhombus is 110 cm\(^2\). If the diagonals are 20 cm and (2x + 1) cm long, find the value of x.

A. 5.0
B. 4.0
C. 3.0
D. 2.5

Question 35:

• WAEC 2015

Simplify: \(\frac{3x - y}{xy} - \frac{2x + 3y}{2xy} + \frac{1}{2}\)

A. \(\frac{4x + 5y - xy}{2xy}\)
B. \(\frac{5y - 4x + xy}{2xy}\)
C. \(\frac{5x + 4y - xy}{2xy}\)
D. \(\frac{4x - 5y + xy}{2xy}\)