Could someone PLEASE help me with these physics questions? please show work, I WILL RATE GOOD

Now that we have a better feel for the symmetry of the problem, let's return to two concentric insulators with uniform volume charge density p > 0 for inner one and -p for the outer one, separated by a neutral insulator. If we were to slice the system in half the interior would look like:5 (10) Now consider the electric field in the neutral insulator RI E r E R2: (a) What closed surface should we integrate over? (b) What is f E . dA on that surface in terms of E, r and L? (c) What is Gene in terms of p, r and/or RI, and L? Find E(r). (11) Next consider the electric field in the outer, negatively charged insulator. Proceeding as in the previous item: (a) What closed surface should we inte- grate over? (b) What is f E . dA on that surface in terms of E, r and L? (c) What is Qend in terms of p, r and/or RI and/or R2, and L? Find E(r). (12) Finally, consider the electric field outside r > R3. Proceeding as in the previous item: (a) What closed surface should we integrate over? (b) What is f E . dA on that surface in terms of E, r and L? (c) What is Cenci in terms of p, r and/or RI and/or R2 and/or R3, and L? Find E(r)