Calculus problems please help me

Hello

I am studying calculus in my year 12.please can u help me to solve this problems.please give me step by step process.
Thank you very much.:q:

  1. The area bounded by the curve y = Tan-1x, the x-axis and the line x = 1 is rotated about the y-axis. Find the volume of the solid generated. Answer = 1.793 cubic units

**2. **A solid sphere of radius 6 cm has a cylindrical hole of radius 1 cm bored through its centre. What is the volume of the remainder of the sphere?

**3. **Find the volume of a truncated cone of height 10 cm, a base radius of 5 cm and a top radius of 2 cm. Answer = 130 cm3

**4. **Find the volume of a torus (donut-shaped figure) generated by rotating a circle x2 + (y-10)2 = 16 about the x-axis (give answer in cm3). Answer = 320 cm3