1 Easy Math Problem <precalc>

4) Tumors are sometimes treated by irradiating them with gamma rays from a radioactive source such

as cobalt-60. The intensity of radiation (in milliroentgens per hour, written mr/hr) is proportional to the

reciprocal of the distance squared from the source (in meters). Suppose that for a particular source, the

intensity is 100 mr/hr at 4 meters. Generate an equation that describes the distance from the source as a function of the intensity of radiation.

Need proper notation and rationale. Teacher is very picky.