Please solve correctly

Part A A parallel-plate capacitor has plates with an area of 440 cm and an air-filled gap between the plates that is 2.30 mm thick. The capacitor is charged by a battery to 590 V and then is disconnected from the battery. How much energy is stored in the capacitor? U = Submit Previous Answers Request Answer X Incorrect; Try Again; 23 attempts remaining Part B The separation between the plates is now increased to 4.20 mm . How much energy is stored in the capacitor now? U = Submit Request Answer Part C How much work is required to increase the separation of the plates from 2.30 mm to 4.20 mm ? AEd 3 Submit Request