The city is using sand trucks to place sand in the road during icy conditions. which best explains the use of sand? a. the sand increases friction by increasing surface area b. the sand increases friction by increasing roughness c. the sand decreases friction by increasing surface area d. the sand decreases friction by increasing roughness.

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.)