Mathematics (2018) | Study Mode

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Question 31
A
20
B
30
C
48
D
60
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: D
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Question 32
A
5x + 7y = 20
B
7x + 5y = 70
C
xy = 7
D
15x + 17y = 90
Explanation

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Correct option: B
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Question 33
A
N828.00
B
N756.00
C
N720.00
D
N684.00
Explanation

Since the salary increases by 36 after every 6 months

Every 6 months that can be counted on the eight month of the third year is 5

(i.e. 2 times in the first year, 2 times in the second year and once in the third year)

His salary then = initial salary + increment

= 540 + 5(36)

= 540 + 180

= ?720.00

It can also be solves using a sequence in form of an AP

Answer is C


Correct option: C
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Question 34
A
52cm
B
43cm
C
40cm
D
15cm
Explanation

Tan 74 = 150/x

x = 150/tan 74

= 43.01cm


Correct option: B
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Question 35
A
3x\(^3\) - 2x\(^2\) + x + c
B
2x\(^3\) - x\(^2\) + x + c
C
2x\(^3\) 3x\(^2\) + c
D
x\(^3\) + x\(^2\) x + c
Explanation

Explanation not provided, please join discuss, your contributions are welcomed


Correct option: B
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Question 36
A
72
B
144
C
360
D
720
Explanation

The word LEADER has 1L 2E 1A 1D and 1R making total of 6! \(\frac{6}{1!2!1!1!1!}\) = \(\frac{6!}{2!}\)

= \(\frac{6 \times 5 \times 4 \times 3 \times 2 \times 1}{2 \times 1}\)

= 360


Correct option: C
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Question 37
Mathematics (2018) Q 37 image
A
32cm
B
24 cm
C
16 cm
D
12 cm
Explanation

From the figure,

XMN = XZY

Angle X is common

So, XNM = XYZ

Then from the angle relationship

\(\frac{XM}{XZ}\) = \(\frac{XN}{XY}\) = \(\frac{MN}{ZY}\)

XM = 8, XZ = 12 + 4 = 16,

XN = 12, XY = 8 + YM

\(\frac{8}{16}\) = \(\frac{12}{(8 +YM) }\)

Cross multiply

8(8 + YM) = 192

64 + 8YM = 192

8YM = 128

YM = \(\frac{128}{8}\)

= 16cm


Correct option: C
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Question 38
A
3%
B
3 \(\frac{1}{3}\)%
C
15%
D
30%
Explanation

The two numbers must be expressed in the same unit. To convert 495g to kg, it will be divided by 1000

495g = \(\frac{495}{1000}\)

= 0.495kg

To express in percentage, 0.495 will be divided by 16.5 and then multiplied by 100

% will be added to the answer \(\frac{0.4950}{16.5}\) x 100

= 3%


Correct option: A
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Question 39
A
-4
B
-2
C
2
D
4
Explanation

23 - 4) ( 23 + 4)

= 12 + 83 - 83 16

= 12 16

= -4

The two expressions in the bracket are conjugate of each other


Correct option: A
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Question 40
A
y = 2x - 4
B
y = 2x + 4
C
y = 2x - 2
D
y = 2x + 2
Explanation

The gradient to the curve is found by differentiating the curve equation with respect to x

So \(\frac{dy}{dx}\) 2x - 2

The gradient of the curve is the same with that of the tangent.

At point (2, 0) \(\frac{dy}{dx}\) = 2(2) - 2

= 4 2 = 2

The equation of the tangent is given by (y - y1) \(\frac{dy}{dx}\) (x x1)

At point (x1, y1) = (2, 0)

y - 0 = 2(x - 2)

y = 2x - 4


Correct option: A

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