1. The problem statement, all variables and given/known data I have a question about notation. My professor posted an older practice test with some different notation techniques than I am used to. "Sphere Charge Find the electric field 2.5 m from the center of a region of space with a charge density given by ro=5.5 E-15 R**(2.3)" I understand most of it but am unsure what the R**(2.3) means. 2. Relevant equations E = kQ/r^2 ρ = 5.5 E-15 3. The attempt at a solution I assume the R**(2.3) has something to do with the volume of the sphere but other than that I have nothing. Attached is a screenshot of the question.