# Mathematics 2009 | Study Mode

Question 91
A
y = 2 + 7x + 4x2
B
y = 2 - 7x + 4x2
C
y = 2 + 7x - 4x2
D
y = 2 - 7x - 4x2
##### Explanation
x = -2 or x = $$\frac{1}{4}$$

(x + 2)(4x - 1) = 0

y = 2 - 7x - 4x2

Question 92
A
47o
B
52o
C
56o
D
99o
##### Explanation
TXY = XTY = 47o(Basa angle of an isosceles $$\bigtriangleup$$)

< TYZ = 94o

no = 180 - (94o + 34o)

= 180o - 128o

= 52o

Question 93
A
80
B
95
C
100
D
115
##### Explanation
$$\begin{array}{c|c} Mark & No. of Candidate\\\hline 60 & 40\\ 70 & 25\\ 80 & 15\\ 90 & 10 \\100 & 5 \\\hline & 95 \end{array}$$

Question 94
A
45
B
50
C
60
D
75
##### Explanation
Angle of apple = 360 - 315 = 45o

No. of apple = $$\frac{45}{360} \times 400$$

= 50

Question 95
A
18%
B
28%
C
36%
D
50%