Are mountain ranges in the oceans, where the crust is young and there is almost no sediment

The intensity, or loudness, of a sound can be measured in decibels (db), according to the equation , where i is the intensity of a given sound and is the threshold of hearing intensity. what is the intensity, in decibels, [i(db)], when ? use a calculator. round to the nearest whole number. 8 9 19 80

What are two different ways you could find the value of a? explain these methods.

What happens when you slowly pulled the carboard?