Quantitative Aptitude - Arithmetic Ability Questions

If the value of √42 is approximately 6.480, then what is the approximate value of √(6/7)?

Select the odd number from the given alternatives.

Which of the following equations has the sum of its roots as 11?

[sinA/(1 + cosA)] + [(1 + cosA)/sinA] is equal to

What is the value of x4+y4 when the value of x3+y3=8 and x+y=2 ?

An octahedron has 6 vertices. How many edges does it have?

Coefficient of x2 in 6x3 + 4x2 + 2x + 3 is

ΔABC is an equilateral triangle and D, E are midpoints of AB and BC respectively. Then the area of ΔABC : the area of the trapezium ADEC is