Do u know a site where i can practice squares​

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)

Factor the following expression completely 6x^11-24x^7