Please help me with this question I have already done it twice and I keep getting it wrong.

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Density, density, density. (a) Acharge -352e is uniformly distributed along a circular arc of radius 7.00 cm, which subtends an angle of 50. What is the linear charge density along the arc? (b) A charge -3526 is uniformly distributed over one face of a circular disk of radius 3.60 cm. What is the surface charge density over that face? (c) A charge -352e is uniformly distributed over the surface of a sphere of radius 2.30 cm. What is the surface charge density over that surface? (d) A charge -352e is uniformly spread through the volume of a sphere of radius 4.40 cm. What is the volume charge density in that sphere? 4} (a) Number I Units (D (b) Number I Units (D (c) Number a Units (D (cl) Number I Units