The Richter scale is utilized to estimate magnitude of the earthquake. Magnitude, R, is given by equation R = 0.65log(0.39E) + 1.45, where E is energy (measured in kilowatt-hours) released by earthquake. Find amount of energy released by the earthquake of magnitude 7.5. First, simplify problem so that it is written in form b = log a. Then, solve problem for E, energy released by earthquake.