Please reply as soon as posible, It's a math question (Pre-Calculus) To measure the M magnitude of an earthquake (or tremor), the most widely used scale in Costa Rica y el mundo, is the Richter scale,...

To measure the M magnitude of an earthquake (or tremor), the most widely used scale in Costa Rica y el mundo, is the Richter scale, the name given to it by its creator Charles Richter in 1935, this is a logarithmic scale and measures the seismic energy released in each earthquake regardless of intensity, that is, it is a comparative measure more than absolute. The scale values ​​are in the range [1, +∞[, in theory it does not have limit, but a 9 on the scale is considered to correspond to “total destruction”.In this scale the formula M = log(I/I₀),  where I is the intensity of the earthquake and I₀ is the intensity of a reference standard earthquake.

a) On September 5, 2012, in Costa Rica, the “great Nicoya earthquake” occurred, witha magnitude of 7.8 degrees according to the Richter scale, how much more intensity did it have?this earthquake compared to the intensity of a 3.9 earthquake on the scaleof Richter that is hardly perceived by the population?

b) The largest earthquake recorded in history (since these phenomena are measured) isthe “Valdivia Earthquake”, which occurred in Chile on May 22, 1960 with a magnitude 9.5 degrees on the Richter scale, how much more intense was this earthquake compared to the intensity of the "great Nicoya earthquake"?

c) For each point of magnitude on the Richter scale, how much does the intensity increase of a tremor?