Solving Logarithmic Equations using Technology — Unit test Answers

What is the domain of ?

Kim solved the equation below by graphing a system of equations.What is the approximate solution to the equation?

The magnitude, M, of an earthquake is defined to be , 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. Which equation represents the magnitude of an earthquake that is 10 times more intense than a standard earthquake?