2005 - JAMB Mathematics Past Questions and Answers - page 2
11
A polynomial in x whose zeros are -2, -1 and 3 is
A
x3 - 7x + 6
B
x3 + 7x - 6
C
x3 + 7x + 6
D
x3 - 7x - 6
12
The time taken to do a piece of work is inversely proportional to the number of men employed. If it takes 30 men to do a piece of work in 6 days, how many men are required to do the work in 4 days?
A
20
B
35
C
45
D
60
13
The weight W kg of a metal bar varies jointly as its length L meters and the square of its diameter d meters. If w = 140 when d = 42/3 and L = 54, find d in terms of W and L.
A
\(\sqrt{\frac{42W}{5L}}\)
B
\(\sqrt{\frac{6L}{42W}}\)
C
\(\frac{42W}{5L}\)
D
\(\frac{5L}{42W}\)
14
Find the range of values of x for which 7x - 3 > 25 + 3x
A
x >7
B
x<7
C
x>-7
D
x<-7
15
A
x \(\leq\) 2
B
0 \(\leq\) x \(\leq\) 2
C
-2 \(\leq\) x \(\leq\) 0, x \(\geq\) 2
D
x \(\leq\) -2, 0 \(\leq\) x \(\leq\) 2
16
If the 7th term of an AP is twice the third term and the sum of the first four terms is 42, find the common difference.
A
6
B
3
C
2
D
1
17
Find the sum of the first 20 terms of the series 8, 12, 16, ....., 96
A
1400
B
1040
C
960
D
920
18
An operation * is defined on the set of real numbers by a * b = ab + 2(a + b + 1). find the identity elements
A
2
B
1
C
-1
D
-2
19
A
60o
B
100o
C
120o
D
140o
20
A
26o
B
43o
C
52o
D
85o
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