1998 - WAEC Mathematics Past Questions and Answers - page 3
21
If h(m+n) = m(h+r) find h in terms of m, n and r
A
\(h=\frac{mr}{2m+n}\)
B
\(h=\frac{mr}{n+m}\)
C
\(h=\frac{m+n}{n}\)
D
\(h=\frac{m+n}{m}\)
22
Given that \(\frac{6x-y}{x+2y}=2\), find the value of \(\frac{x}{y}\)
A
\(\frac{3}{8}\)
B
\(\frac{5}{8}\)
C
\(\frac{4}{5}\)
D
\(\frac{5}{4}\)
23
The radius of a geographical globe is 60cm. Find the length of the parallel of latitude 60oN
A
\(66\pi cm\)
B
\(60\pi cm\)
C
\(30\pi cm\)
D
\(15\pi cm\)
24
In the diagram above, O is the center if the two concentric circle of radii 13cm and 10cm respectively. Find the area of the shaded portion in the sector with angle 1200 at the center
A
\(\frac{1}{3}\pi cm^2\)
B
\(\pi cm^2\)
C
\(3\pi cm^2\)
D
\(23\pi cm^2\)
25
Express as a single fraction: \(\frac{x}{x-2}-\frac{x+2}{x+3}\)
A
\(\frac{2x^2 - 3x - 4}{(x-2)(x+3)}\)
B
\(\frac{2x^2 + 3x - 4}{(x-2)(x+3)}\)
C
\(\frac{2}{(x-2)(x+3)}\)
D
\(\frac{ 3x + 4}{(x-2)(x+3)}\)
26
The following numbers represent at a set of scores for a class of 32 students, where the maximum score possible was 12, 6, 5, 9, 4, 4, 8, 7, 5, 6, 3, 2, 5, 4, 6, 9, 10, 4, 3, 2, 3, 4, 6, 8, 7, 4, 2, 1, 8, 7, 7, 6, 11. What is the percentage of the class, correct to the nearest whole number, scored above 6?
A
34%
B
35%
C
37%
D
38%
27
A die with faces numbered 1 to 6 is rolled once. What is the probability of obtaining 4?
A
\(\frac{1}{36}\)
B
\(\frac{1}{6}\)
C
\(\frac{1}{3}\)
D
\(\frac{1}{2}\)
28
In the diagram above, the area of triangle ABC is 35cm2, find the value of y
A
5cm
B
10cm
C
17.5cm
D
28cm
29
The graph of the quadratic expression
A
\(y=x^2 + x - 2\)
B
\(y=x^2 - x + 2\)
C
\(y=x^2 - x - 2\)
D
\(y=x + x + 2\)
30
The values of x when y = -1 are approximately
A
-10 and 2.0
B
-1.3 and 2.3
C
-0.6 and 2.6
D
-0.6 and 1.6
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