Calculus and Coordinate

If 28x + 30y + 31z = 365, where x,y,z € N.
Then x+y+z = ?

Last Non Zero Digit of 17! is...

The smallest positive integer having all digits even and being a multiple of 9.

How many Perfect squares are there whose all digits are equal ?

Area of the Ellipse
x^2 + (x+y)^2 = 1 is

Minimum distance of the sphere
x^2 + y^2 + z^2 - 4x - 6y -12z - 13 = 0 from Origin is...

Total number of quadratic equations which are unchanged if their roots are replaced by their square ?

If No. Of diagonals of a n-polygon is 2019 times it’s number of sides. Then n = ?

The Remainder when 27^40 is divided by 12 is...

There are three(non-collinear) points in a plane.
Total Number of Lines equidistant from all given Points is: