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Solve for x in the quadratic equation. 2x2 + 12x + 10 = 0
Ax = -5, -1
Bx = -5,1
Cx = -3, -2
Dx = 3, 2
Ex = 6, 5
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Question 12
neco2005
Find the Iength of a diagonal of a square whose area is 288cm2.
A24cm
B48cm
C95cm
D100cm
E124cm
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Question 13
neco2005
A flagpole is placed at the top of a tower. The angles of elevation of the bottom and top of the flagpole from a point on the ground 10m away are 40° and 50° respectively. Find the length of the flagpole.
A1.8m
B3.5m
C8.4m
D11.9m
E17.3m
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Question 14
neco2005
Find the value of 2a - b if a + b = 8 and 4a - b = 22
A2
B4
C6
D8
E10
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Question 15
neco2005
What is the positive difference between the squares of 2.5 and 2.1 to 1 significant figures?
A– 2.0
B– 184
C-1.84
D2
E18.4
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Question 16
neco2005
If A(I,2,3,...,10) ; B = (-5,-4,.....,-1) ; C = (-1, 0, 1, 2,....5) List all the elements in (B ∪ C) ∩ A
A(-1,2,...5)
B(-1,1,....5)
C(1,2,..5)
D(2,3,...10)
E(1,2,...10)
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Question 17
neco2005
A car dealer sells a car and makes a profit of 15%. If the car costs N320,000.00, how much did he sell the car?
AN272,000.00
BN296,000.00
CN300,000.00
DN368,000.00
EN400,000.00
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Question 18
neco2005
A bag contains 4 blue and 8 red identical balls. If two balls are picked at random with replacement, what is the probability of picking two balls of different colours?
A1
B\(\frac{13}{26}\)
C\(\frac{5}{18}\)
D\(\frac{4}{9}\)
E\(\frac{2}{9}\)
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Question 19
neco2005
Evaluate log 18 + log6 - log16\(^{\frac{1}{2}}\)
Alog 3
Blog 9
Clog 20
D3 log 2
E3 log 3
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Question 20
neco2005
For what value(s) of x is the expression (x2 + 15x + 50) ÷ (x - 5) not defined
A-5, -10
B-10
C-5
D5
E10, 5
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Question 21
neco2005
In Δ ABC, A = 60°, C = 90° and AC = 12m. Find the Length of the hypotenuse.
A24m
B14m
C12m
D7m
E6m
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Question 22
neco2005
Find the absolute mean deviation of the sample 10, 12, 14, 11, 13.
A14.6
B14
C12
D6.2
E1.2
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Question 23
neco2005
Simplify (6 - x - x2) ÷ (x2 - 4)
A(3 + x) ÷ (x + 2)
B(x - 3) ÷ (x - 2)
C(x - 3) ÷ (x + 3)
D(3 - x) ÷ (x + 2)
E(3 - x) ÷ (x - 2)
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Question 24
neco2005
If (x - a) is a factor of bx - ax + x2 - ab, what is the other factor?
A(x + b)
B(b - a)
C(x - a)
D(a + b)
E(a - b)
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Question 25
neco2005
Mohammed is 8 years older than Joy now. In five years’ time he will be twice as old as Joy. How old is Joy now?
A1\(\frac{1}{2}\)years
B3years
C4\(\frac{1}{2}\)years
D6 years
E8 years
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Question 26
neco2005
The diagonals of a rhombus are 6cm and 8cm. Find the area of the rhombus.
A96cm2
B48cm2
C24cm2
D0.14cm2
E12cm2
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Question 27
waec2005
The figure shows a quadrilateral PQRS having equal sides and opposite sides parallel. The diagonals PR and QS intersect perpendicularly at O, Which of the following statements cannot be correct
A|PO|=|RO|
BPQR is an equilateral triangle
CPQRX is a parallelogram
DThere are two lines of symmetry
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Question 28
waec2005
In the diagram, O is the center of the circle, ∠MON = 80o, ∠LMO = 10o and ∠LNO = 15o. Calculate the value of x
A40o
B50o
C55o
D75o
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Question 29
waec2005
The monthly salary of a man increased from N2,700 to N3,200. Find the percentage increase
A10%
B15%
C15.6%
D18.5%
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Question 30
waec2005
Ladi sold a car for N84,000 at a loss of 4%. How much did ladi buy the car?
