Rotation 180 degrees about the orgin HELP DUE SOON NO LINKS

What number should be added to both sides of the equation to complete this square? x^2-10x=7

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

The volume of the sun is approximately 1 × 10^18 cu km, while the volume of jupiter is approximately 1 × 10^15 cu km. which of the following is true? a. the volume of jupiter is approximately one thousand times the volume of the sun. b. the volume of jupiter is approximately one hundred times the volume of the sun. c. the volume of the sun is approximately one thousand times the volume of jupiter. d. the volume of the sun is approximately one hundred times the volume of jupiter.