Quantitative Aptitude - Arithmetic Ability Questions

If a+1a2 = 3, then the value of  a3+1a3 is

What is the altitude of an equilateral triangle whose side is 12 cm?

Which of the following quadratic equations has real roots?

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

A shopkeeper marks his goods 40% above the cost price and allows a discount of 25% on it. His gain % is

If cosx.cosy + sinx.siny = -1 then cosx + cosy is

What is the value of sin(11π/6)?

What are the co-ordinates of the centroid of a triangle, whose vertices are A(1, -5), B(4, 0) and C(-2, 2)?