Waec Further Mathematics 2013 Past Questions and Answers

Question 21:

• WAEC 2013

The function \(f : F \to R\)
= \(f(x) = \begin{cases} 3x + 2 : x > 4 \\ 3x - 2 : x = 4 \\ 5x - 3 : x < 4 \end{cases}\). Find f(4) - f(-3).

A. 28
B. 26
C. -26
D. -28

Question 22:

• WAEC 2013

A committee consists of 5 boys namely: Kofi, John, Ojo, Ozo and James and 3 girls namely: Rose, Ugo and Ama. In how many ways can a sub-committee consisting of 3 boys and 2 girls be chosen, if Ozo must be on the sub-committee?

A. 35
B. 30
C. 18
D. 12

Question 23:

• WAEC 2013

Forces 50N and 80N act on a body as shown in the diagram. Find, correct to the nearest whole number, the horizontal component of the resultant force.

A. 13N
B. 43N
C. 57N
D. 95N

Question 24:

• WAEC 2013

The sales of five salesgirls on a certain day are as follows; GH¢ 26.00, GH¢ 39.00, GH¢ 33.00, GH¢ 25.00 and GH¢ 37.00. Calculate the standard deviation if the mean sale is GH¢ 32.00.

A. GH¢ 5.65
B. GH¢ 5.66
C. GH¢ 6.5
D. GH¢ 6.56

Question 25:

• WAEC 2013

A circular ink blot on a piece of paper increases its area at the rate \(4mm^{2}/s\). Find the rate of the radius of the blot when the radius is 8mm. \([\pi = \frac{22}{7}]\).

A. 0.20 mm/s
B. 0.08 mm/s
C. 0.25 mm/s
D. 0.05 mm/s