For the parabola `9x^2-24xy +16y^2-20x-15y-60 = 0` which of the following is/are true

For the ellipse 4x^(2)+5y^(2)-16x-30y+60=0 , which of the following is true ?

The focus and directrix of the parabola 9 x ^(2) - 24 xy + 16 y^(2) - 20 x - 15 y - 60 = 0 is _

The focus and directrix of the parabola 9x^(2)-24xy+16y^(2)-20x-15y-60=0 is

A circle rolls between pair of lines 9x^(2)+24xy +16y^(2) - 25 =0 touching both of them. Then its area is

A circle rolls between pair of lines 9x^(2)+24xy +16y^(2) - 25 =0 touching both of them. Then its area is

A circle rolls between pair of lines 9x^(2)+24xy +16y^(2) - 25 =0 touching both of them. Then its area is

A circle rolls between pair of lines 9x^(2)+24xy +16y^(2) - 25 =0 touching both of them. Then its area is

If 3x+4y+k=0 represents the equation of tangent at the vertex of the parabola 16x^(2)-24xy+9y^2+14x+2y+7=0 , then the value of k is ________ .

If 3x+4y+k=0 represents the equation of tangent at the vertex of the parabola 16x^(2)-24xy+9y^2+14x+2y+7=0 , then the value of k is ________ .

x^(2)-16=0, y^(2)-9y + 20 = 0