Please help last question t pass lesson

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

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.

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2