Ok so I need some help with this "assignment" lol

What is the volume of the sphere shown below with a radius of 3?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x