The row-echelon form of the augmented matrix of a system of equations is given. find the solution of the system
(1 0 4 - 1
0 1 -1 : 3
0 0 1 1

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.