Can someone help me with this? I’m mad with frequency, thanks! :)

Can someone pls ! pls answer all. no explanation needed..

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=