Can someone sent some gravity questions

How is the gravitational force related to the distance between two objects?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)