Using 3.14 for it, what is the volume, to the nearest cubic centimeter, of a ball with a diameter of 7 centimeters

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.

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

How do i simply this radical expression?