1/x=6/x+15 , 20-x/x=6/4, and 4/12=x+2/2x+13

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 you are just building your payment history, how many points from a perfect score will you possibly miss?

Can someone me with these two circle theorem questions asap?