The graph contains a system of equations. What two equations are represented in this system? Select all that apply.

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.

Use the graph of the sine function y=2sinθ shown below

Having a hard time understanding this question (see attachment).