I need help solving these problems. step by step solutions so i can understand and then work it backwards. please no cursive

Problem 2 A solenoid is wound with 100 turns of wire on a core with radius 2cm and length 20cm. The solenoid carries a current of 0.1A. (a )What is the inductance of the solenoid assuming it has the same field of an infinitely long solenoid? (b)What is the magnetic field at the center of the solenoid? (c)What is the magnetic flux linking the solenoid? (d)What is the magnetic energy stored in the solenoid, using the ideal solenoid approximation? (e) If the current in the solenoid is I(t) - 10t- A/s, what is the voltage across the solenoid? Problem 3 A transformer is made of a primary with 50 turns and a secondary with 100 turns. The voltage across the primary is 50V. What is the voltage out of the secondary for the given voltage across the primary