135

145

125

165

Suppose a satisfies the equation 4 = 𝑎 + 𝑎 ^−1. What is the value of 𝑎^ 4 + 𝑎^ −4?

182

183

192

194

135

145

125

165

(√13)/2

(√11-√13)/2

(√11+√13)/2

11

121

111

11

101

0.5

0.75

0.25

0.33

If the angles of a triangle are in the ratio of 4:5:2, the triangle is :

An acute-angled triangle

An obtuse-angled triangle

A right-angled triangle

An isosceles triangle

A function f is defined by f(x)=6x−53. What is the value of f(11)?

10

-13

20

13

In a right-angled △ABC,∠ACB=60^∘,∠BAC=30^∘ , and ∠ABC=90^∘. If AC=8 cm, then the length of BC is cm.

8

2

4

16

x-y=0

x + y=0

x+2y=0

x-2y=0