Find the equation of hyperbola whose foci s (6,4)and s' (-4,4) and e=2

11th sum

Find the equation of locus of all points such that the difference  of their  distances  from (4,0)and (-4,0) is always equal to 2

Elements maths 11class 

Suppose f is even. What is f0(0)? Draw a picture that illustrates this phenomenon.

Angle in a semicircle is a right angle

In a survey of 400 students

Integrate sinx/sqrt (2+sin2x)

Find mean deviations about median 
3,9,5,3,12,10,18,4,7,19,21