a circuit is built based on this circuit diagram.

a diagram of a closed circuit with a power source on the left labeled 12 v. there are 3 resistors in parallel, separate paths, connected to it labeled 3.0 ohms, 6.0 ohms and 9.0 ohms.

what is the equivalent resistance of the circuit?

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.)