in calculating the number of electrons

In an experiment you observed the attraction of a charged object to the wall. It correctly depicts the microscopic level mechanism for this observation. Identify the correct statements that apply when the object is negatively charged. PLEASE SELECT ALL THAT APPLY

I only want 4 and 5. I pasted the whole question as a reference only.   Two parallel plates, each having area A = 3085cm2 are connected to the terminals of a battery of voltage Vb = 6 V as shown. The plates are separated by a distance d = 0.49cm. You may assume (contrary to the drawing) that the separation between the plates is small compared to a linear dimension of the plate. 1) What is C, the capacitance of this parallel plate capacitor? 2) What is Q, the charge stored on the top plate of the this capacitor?. 3) A dielectric having dielectric constant κ = 3.4 is now inserted in between the plates of the capacitor as shown. The dielectric has area A = 3085 cm2and thickness equal to half of the separation (= 0.245 cm) . What is the charge on the top plate of this capacitor? 4) What is U, the energy stored in this capacitor? 5) The battery is now disconnected from the capacitor and then the dielectric is withdrawn. What is V, the voltage across the capacitor?

please do part d and e